Add a webserver + website framework to Tails Server

.. possibly a wiki.
On #12236 segfault says he has already implemented lighthttpd.
So it should be decided if we want to do that at all, and if yes, which website framework or wiki shall be used.

Parent Task: #12236

Related issues

Related to #12230

Original created by @u on 15171 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information