Improve scanability of instructions to configuration administration password
During the user testing of the Additional Software beta, I felt that the interactions and how they were documeted could be make faster to grasp (as people don’t read but scan).
For example, highlighting the [+] button in red on https://tails.boum.org/doc/first_steps/startup_options/additional.png can’t hurt since we only use this screenshot to give context and point to it.
Once in Tails Greeter the button still works fine, even with first timers.
Feature Branch: 8650e1c5
Parent Task: #15567 (closed)