tails-documentation should prefer online docs

I.e. what sajolida requested in #14962-note_15: “How crazy would it be to open the doc online if Tor is ready and in the help browser if Tor is not ready?”

Feature Branch: feature/15332-prefer-online-docs

Related issues

Related to #15371 (closed)

Original created by @anonym on 15332 (Redmine)

Edited Nov 22, 2019 by intrigeri

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