restructure schleuder doc page

Also adds a fix for schleuder-cli config

service/schleuder.md

 # Schleuder
 
+Schleuder is a gpg-enabled mailing list manager with resending-capabilities. Subscribers can communicate encrypted (and pseudonymously) among themselves, receive emails from non-subscribers and send emails to non-subscribers via the list.
+
+For more details see https://schleuder.nadir.org/docs/.
+
+Schleuder runs on [Eugeni](https://db.torproject.org/machines.cgi?host=eugeni). The version of Schleuder currently installed is: 3.1.2
+
 ## Using Schleuder
 
 Schleuder has it's own gpg key, and also it's own keyring that you can use if you are subscribed to the list.
@@ -36,19 +42,29 @@ And then:
     X-LIST-NAME: listname@withtheemail.org
     X-GET-KEY: someone@important.org
 
-## Administration
-
-Schleuder is a gpg-enabled mailing list manager with resending-capabilities. Subscribers can communicate encrypted (and pseudonymously) among themselves, receive emails from non-subscribers and send emails to non-subscribers via the list.
+## Administration of lists
 
-For more details see https://schleuder.nadir.org/docs/.
+### Pre-requisites
 
-Schleuder runs on [Eugeni](https://db.torproject.org/machines.cgi?host=eugeni). The version of Schleuder currently installed is: 3.1.2
+#### schleuder-api-daemon
 
 Mailing lists are managed through schleuder-cli which needs schleuder-api-daemon running. If the daemon is not running you can start it with:
 
     SCHLEUDER_CONFIG="/srv/schleuder.torproject.org/data/schleuder.yml" schleuder-api-daemon 
 
-Lists also need to be setup in postfix in order to forward to Schleuder.
+#### schleuder-cli
+
+The program `schleuder-cli` program expects to find a configuration file in `$HOME/.schleuder-cli/schleuder-cli.yml`.
+
+If it's absent, the following error may appear:
+
+    Error: 'tls_fingerprint' is empty but required (in /root/.schleuder-cli/schleuder-cli.yml).
+
+The workaround for this problem is to simply tell the program to look elsewhere for that file:
+
+    export SCHLEUDER_CLI_CONFIG="/srv/schleuder.torproject.org/home/.schleuder-cli/schleuder-cli.yml"
+
+### List creation
 
 To create a list you can:
 
@@ -60,10 +76,14 @@ To export a list public key you can do the following:
 
     schleuder-cli keys export secret-team@lists.torproject.org <list-key-fingerprint>
 
+### Subscriptions management
+
 Subscription are managed with the subscriptions command. To subscribe a new user to a list do:
 
     schleuder-cli subscriptions new secret-team@lists.torproject.org person@torproject.org <fingerprint> /path/to/public.key
 
+### Other commands
+
 All the other commands are available by typing:
 
     schleuder-cli help