Huge role refactoring/cleanup. Other commits will propably follow. Because some bugs will exist. Still important for longrun and also for auto docs/help/slideshow generation

roles/web-app-nextcloud/templates/config/turnserver.config.php.j2.draft

@@ -0,0 +1,12 @@
+<?php
+# Activates the turn server
+# @see https://nextcloud-talk.readthedocs.io/en/latest/TURN/
+
+return 'turn_servers' => [
+    [
+        'host' => 'coturn',
+        'port' => 3478,
+        'secret' => 'my-secret-key',
+        'protocols' => 'udp,tcp'
+    ]
+];