Mention GNOME Help on the introduction to GNOME
Originally created by @sajolida on #8675 (Redmine)
We should add “Applications → Accessories → Help” to /doc/first_steps/introduction_to_gnome_and_the_tails_desktop as it is a valuable ressources for GNOME in general and we don’t want to duplicate the information that’s in there already.
Feature Branch: doc/8675-help_desktop