remove excess appeals

Block creating appeals from Tor exit nodes (UTRS2#445)

Feb 2021 Round 1 updates (UTRS2#431)

+ cosmetic fix for onwiki table (coatrack fix)

Display UTRS version and bug report link on page footer (UTRS2#393)

Improve navbar (UTRS2#383)

Store users CentralAuth IDs to allow detecting renamed users (UTRS2#356)

Appeal action refactor (UTRS2#292)

Split appeal actions to a new controller (except replying, those are too different and will be handled separately) and add tests for them.