use big thumbnails for all screenshots

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

pmg-administration.adoc

@@ -13,7 +13,7 @@ Server Administration
 Server status
 ~~~~~~~~~~~~~
 
-image::images/screenshot/pmg-gui-server-status.png[]
+[thumbnail="pmg-gui-server-status.png", big=1]
 
 This page shows server statistics about CPU, memory, disk and network
 usage. You can select the displayed time span on the upper right.
@@ -26,7 +26,7 @@ button. It is also possible to trigger a server 'Restart' or
 Services
 ~~~~~~~~
 
-image::images/screenshot/pmg-gui-service-status.png[]
+[thumbnail="pmg-gui-service-status.png", big=1]
 
 This panel lists all major services used for mail processing and
 cluster synchronization. If necessary, you can start, stop or restart
@@ -45,7 +45,7 @@ systemctl status postfix
 Updates
 ~~~~~~~
 
-image::images/screenshot/pmg-gui-updates.png[]
+[thumbnail="pmg-gui-updates.png", big=1]
 
 We release software updates on a regular basis, and it is recommended
 to always run the latest available version. This page shows the
@@ -59,7 +59,7 @@ details abaout available package repositories.
 Syslog and Tasks
 ~~~~~~~~~~~~~~~~
 
-image::images/screenshot/pmg-gui-syslog.png[]
+[thumbnail="pmg-gui-syslog.png", big=1]
 
 The syslog page gives you a quick real-time log view. Please use the
 xref:pmg_tracking_center[Tracking Center] to search the logs.
@@ -71,7 +71,7 @@ Quarantine
 Spam
 ~~~~
 
-image::images/screenshot/pmg-gui-spam-quarantine.png[]
+[thumbnail="pmg-gui-spam-quarantine.png", big=1]
 
 This panel lets you inspect the mail quarantine. Emails can be safely
 previewed and if desired, delivered to the original user.
@@ -109,7 +109,7 @@ users can manage this themselves.
 Tracking Center
 ---------------
 
-image::images/screenshot/pmg-gui-tracking-center.png[]
+[thumbnail="pmg-gui-tracking-center.png", big=1]
 
 Email processing is a complex task and involves several service
 daemons. Each daemon logs information to the syslog service. The

pmg-installation.adoc

@@ -139,7 +139,7 @@ Further configuration is done via the Proxmox web interface. Just
 point your browser to the IP address given during installation
 (https://youripaddress:8006).
 
-image::images/screenshot/pmg-gui-login-window.png[]
+[thumbnail="pmg-gui-login-window.png", big=1]
 
 . Login and upload subscription key.
 +

pmg-mail-filter.adoc

@@ -6,7 +6,7 @@ Rule-Based Mail Filter
 powerful way to define filter rules by user, domains, time frame,
 content type and resulting action.
 
-image::images/screenshot/pmg-gui-mail-filter-rules.png[]
+[thumbnail="pmg-gui-mail-filter-rules.png", big=1]
 
 Every rule has 5 categories ('FROM', 'TO', 'WHEN', 'WHAT' and
 'ACTION'), and each category may contain several objects to match
@@ -63,7 +63,7 @@ reset the filter rules.
 'Action' - objects
 ------------------
 
-image::images/screenshot/pmg-gui-mail-filter-actions.png[]
+[thumbnail="pmg-gui-mail-filter-actions.png", big=1]
 
 Please note that some actions stops further rule precessing. We call
 such actions 'final'.
@@ -167,7 +167,7 @@ Add a Disclaimer.
 'Who' - objects
 ---------------
 
-image::images/screenshot/pmg-gui-mail-filter-who-objects.png[]
+[thumbnail="pmg-gui-mail-filter-who-objects.png", big=1]
 
 This type of objects can be used for the 'TO' and/or 'FROM' category,
 and macth the sender or receiver of the e-mail. A single object can
@@ -202,7 +202,7 @@ or allow specific senders.
 'What' - objects
 ----------------
 
-image::images/screenshot/pmg-gui-mail-filter-what-objects.png[]
+[thumbnail="pmg-gui-mail-filter-what-objects.png", big=1]
 
 'What' - objects are used to classify the mail content. A single
 object can combine multiple items, and the following item types are
@@ -237,7 +237,7 @@ Can be used to match specific content types inside archives.
 'When' - objects
 ----------------
 
-image::images/screenshot/pmg-gui-mail-filter-when-objects.png[]
+[thumbnail="pmg-gui-mail-filter-when-objects.png", big=1]
 
 'When' - objects are use to activate rules at specific daytimes. You
 can compose them of one or more time-frame items.

pmgbackup.adoc

@@ -25,7 +25,7 @@ Backup and Restore
 endif::manvolnum[]
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-backup.png[]
+[thumbnail="pmg-gui-backup.png", big=1]
 endif::manvolnum[]
 
 {pmg} includes the ability to backup and restore the

pmgcm.adoc

@@ -206,7 +206,7 @@ be changed later.
 Creating a Cluster
 ~~~~~~~~~~~~~~~~~~
 
-image::images/screenshot/pmg-gui-cluster-panel.png[]
+[thumbnail="pmg-gui-cluster-panel.png", big=1]
 
 You can create a cluster from any existing {pmg} host. All data is
 preserved.
@@ -241,7 +241,7 @@ pmg5(1)              192.168.2.127   master A       1 day 21:18   0.30    80%
 Adding Cluster Nodes
 ~~~~~~~~~~~~~~~~~~~~
 
-image::images/screenshot/pmg-gui-cluster-join.png[]
+[thumbnail="pmg-gui-cluster-join.png", big=1]
 
 When you add a new node to a cluster (using `join`) all data on that node is
 destroyed. The whole database is initialized with cluster data from

pmgconfig.adoc

@@ -195,7 +195,7 @@ Network and Time
 ~~~~~~~~~~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-network-config.png[]
+[thumbnail="pmg-gui-network-config.png", big=1]
 endif::manvolnum[]
 
 Normally the network and time is already configured when you visit the
@@ -235,7 +235,7 @@ Options
 ~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-system-options.png[]
+[thumbnail="pmg-gui-system-options.png", big=1]
 endif::manvolnum[]
 
 
@@ -253,7 +253,7 @@ Relaying
 ~~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-mailproxy-relaying.png[]
+[thumbnail="pmg-gui-mailproxy-relaying.png", big=1]
 endif::manvolnum[]
 
 Those settings are saved to subsection 'mail' in `/etc/pmg/pmg.conf`,
@@ -266,7 +266,7 @@ Relay Domains
 ~~~~~~~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-mailproxy-relaydomains.png[]
+[thumbnail="pmg-gui-mailproxy-relaydomains.png", big=1]
 endif::manvolnum[]
 
 List of relayed mail domains, i.e. what destination domains this
@@ -279,7 +279,7 @@ Ports
 ~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-mailproxy-ports.png[]
+[thumbnail="pmg-gui-mailproxy-ports.png", big=1]
 endif::manvolnum[]
 
 Those settings are saved to subsection 'mail' in `/etc/pmg/pmg.conf`,
@@ -293,7 +293,7 @@ Options
 ~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-mailproxy-options.png[]
+[thumbnail="pmg-gui-mailproxy-options.png", big=1]
 endif::manvolnum[]
 
 Those settings are saved to subsection 'mail' in `/etc/pmg/pmg.conf`,
@@ -363,7 +363,7 @@ Transports
 ~~~~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-mailproxy-transports.png[]
+[thumbnail="pmg-gui-mailproxy-transports.png", big=1]
 endif::manvolnum[]
 
 You can use {pmg} to send e-mails to different internal
@@ -380,7 +380,7 @@ Networks
 ~~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-mailproxy-networks.png[]
+[thumbnail="pmg-gui-mailproxy-networks.png", big=1]
 endif::manvolnum[]
 
 You can add additional internal (trusted) IP networks or hosts.
@@ -395,7 +395,7 @@ TLS
 ~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-mailproxy-tls.png[]
+[thumbnail="pmg-gui-mailproxy-tls.png", big=1]
 endif::manvolnum[]
 
 Transport Layer Security (TLS) provides certificate-based
@@ -435,7 +435,7 @@ DKIM Signing
 ~~~~~~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-mailproxy-dkim.png[]
+[thumbnail="pmg-gui-mailproxy-dkim.png", big=1]
 endif::manvolnum[]
 
 DomainKeys Identified Mail (DKIM) Signatures (see {dkim_rfc}) is a method to
@@ -494,7 +494,7 @@ Whitelist
 ~~~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-mailproxy-whitelist.png[]
+[thumbnail="pmg-gui-mailproxy-whitelist.png", big=1]
 endif::manvolnum[]
 
 All SMTP checks are disabled for those entries (e. g. Greylisting,
@@ -512,7 +512,7 @@ Options
 ~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-spam-options.png[]
+[thumbnail="pmg-gui-spam-options.png", big=1]
 endif::manvolnum[]
 
 {pmg} uses a wide variety of local and network tests to identify spam
@@ -532,7 +532,7 @@ Quarantine
 ~~~~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-spamquar-options.png[]
+[thumbnail="pmg-gui-spamquar-options.png", big=1]
 endif::manvolnum[]
 
 Proxmox analyses all incoming e-mail messages and decides for each
@@ -554,7 +554,7 @@ Customization of Rulescores
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-spam-custom-scores.png[]
+[thumbnail="pmg-gui-spam-custom-scores.png", big=1]
 endif::manvolnum[]
 
 While the default scoring of {spamassassin}'s ruleset provides very good
@@ -592,7 +592,7 @@ Options
 ~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-virus-options.png[]
+[thumbnail="pmg-gui-virus-options.png", big=1]
 endif::manvolnum[]
 
 All mails are automatically passed to the included virus detector
@@ -605,7 +605,7 @@ using the following configuration keys:
 include::pmg.clamav-conf-opts.adoc[]
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-clamav-database.png[]
+[thumbnail="pmg-gui-clamav-database.png", big=1]
 endif::manvolnum[]
 
 Please note that the virus signature database it automatically
@@ -618,7 +618,7 @@ Quarantine
 ~~~~~~~~~~
 
 ifndef::manvolnum[]
-image::images/screenshot/pmg-gui-virusquar-options.png[]
+[thumbnail="pmg-gui-virusquar-options.png", big=1]
 endif::manvolnum[]
 
 Indentified virus mails are automatically moved to the virus
@@ -769,7 +769,7 @@ User management in {pmg} consists of three types of users/accounts:
 Local Users
 ~~~~~~~~~~~
 
-image::images/screenshot/pmg-gui-local-user-config.png[]
+[thumbnail="pmg-gui-local-user-config.png", big=1]
 
 Local users are used to manage and audit {pmg}. Those users can login on the
 management web interface.
@@ -807,7 +807,7 @@ For details of the fields see xref:pmg_user_configuration_file[user.conf]
 LDAP/Active Directory
 ~~~~~~~~~~~~~~~~~~~~~
 
-image::images/screenshot/pmg-gui-ldap-user-config.png[]
+[thumbnail="pmg-gui-ldap-user-config.png", big=1]
 
 You can specify multiple LDAP/Active Directory profiles, so that you can
 create rules matching those users and groups.
@@ -850,7 +850,7 @@ interface. After that, you can create rules targeting LDAP users and groups.
 Fetchmail
 ~~~~~~~~~
 
-image::images/screenshot/pmg-gui-fetchmail-config.png[]
+[thumbnail="pmg-gui-fetchmail-config.png", big=1]
 
 Fetchmail is utility for polling and forwarding e-mails. You can define
 e-mail accounts, which will then be fetched and forwarded to the e-mail