Install process pages that need updating

[keldian]

These pertain to things I don't use personally and are not specifically tied to role-refactor changes.

• https://role-refactor.docs-acq.pages.dev/apps/autoscan

  • still on old repo though we use a fork
  • setup seems Plex-centric though there's Emby and Jellyfin support?
  • is A-Train still relevant?

• https://role-refactor.docs-acq.pages.dev/apps/organizr

  • is in the "TODO - NEED UPDATING" nav section, for a good reason I presume

• https://role-refactor.docs-acq.pages.dev/saltbox/install/after/

  • references to deprecated Ubuntu 20.04 and 24.04 is not addressed