Finish documenting Tails Server

team: spriver, segfault, sajolida

The current documentation is found in the feature/5688-tails-server branch in wiki/src/doc/tails_server/. There is currently a short documentation of the usage of Tails Server in general, how to connect to Tails Server, and how to use the Mumble service. Those should be proofread and improved. Additionally, we (probably?) should also write documentation for the usage of the other available services (Gobby, XMPP, SFTP, lighttpd).

Feature Branch: feature/5688-tails-server

Parent Task: #5688

Related issues

Related to #12231

Original created by @BitingBird on 14456 (Redmine)

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