Documentation updates for Tails 4.0

Originally created by @hefee on #16282 (Redmine)

This is meant to be a place to track things that were changed in Tails and need updates in the documentation.

Traverso was removed (#16353 (closed))
Scribus was removed

Subtasks

Related issues

Blocks #16711 (closed)

Edited May 15, 2020 by hefee

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