Update our doc to Tails 5.0 Bullseye

According to #14578 (closed), in 2022Q2.

• Go through all the pages (@cbrownstein)
  • Things that need to be updated because of 5.0
  • Screenshots
  • Stuff that's very old or badly written
• Have a look at the all tickets on 5.0:
  • See if there's anything interesting in the tickets that are closed already
  • Don't update anything related to PGP yet (#18875 (closed))
• Remove note about #17474 (closed)
• Update our mentions of #17183 (closed)
• Check the interface of GNOME Disks in Debian Bullseye (according to @groente our screenshots and instructions need update)
• Update links
  • /doc/about/features.mdwn
  • /doc/advanced_topics/virtualization/boxes.mdwn
  • /doc/anonymous_internet/electrum.mdwn
  • /doc/anonymous_internet/pidgin.mdwn (for IRC)
• Update to new GNOME Disks on /doc/advanced_topics/persistence/check_file_system.mdwn
  • Find the padlock icons for showing locked/unlocked volume
• Update /install/inc/steps/install_with_gnome_disks.inline.mdwn
• Keep, trim, or prune old migration doc
  • /doc/anonymous_internet/thunderbird/openpgp_migration.mdwn
    • Let's keep it until it breaks, as per our usual policy
  • /doc/encryption_and_privacy/FireGPG_susceptible_to_devastating_attacks.mdwn
  • /doc/encryption_and_privacy/openpgp_keyserver.mdwn
  • /doc/encryption_and_privacy/manage_passwords.mdwn
• Rename gedit to Text Editor
  • /doc/encryption_and_privacy/gpgapplet/public-key_cryptography.mdwn
  • /doc/encryption_and_privacy/gpgapplet/passphrase_encryption.mdwn
  • /doc/encryption_and_privacy/gpgapplet/public-key_cryptography.mdwn
  • /doc/first_steps/bug_reporting.mdwn
• Check whether everything has been fixed (@cbrownstein)
  • /doc/encryption_and_privacy/encrypted_volumes.mdwn
  • /doc/encryption_and_privacy/secure_deletion.mdwn
  • /doc/advanced_topics/persistence/check_file_system.mdwn
  • /doc/first_steps/introduction_to_gnome_and_the_tails_desktop.mdwn
    • Document Activities overview
    • Remove Devices submenu
    • Update /lib/apps/files.png
    • Update /doc/first_steps/introduction_to_gnome_and_the_tails_desktop/emptytrash.png
  • /doc/encryption_and_privacy/veracrypt.mdwn
    • Fix "VeraCrypt for macOS" and "VeraCrypt for Linux" links
• Specify what needs to be updated (@cbrownstein)
  • /doc/anonymous_internet/networkmanager.mdwn
  • /doc/anonymous_internet/thunderbird.mdwn
  • /doc/first_steps/welcome_screen.mdwn
  • /install/clone/mac.mdwn
  • /install/clone/pc.mdwn
  • /install/expert.mdwn
  • /install/inc/steps/clone.inline.mdwn
  • /install/inc/steps/create_persistence.inline.mdwn
  • /install/linux.mdwn
  • /install/mac.mdwn
  • /install/windows.mdwn
  • /upgrade/clone.mdwn
  • /upgrade/linux.mdwn
  • /upgrade/tails.mdwn
  • /upgrade/windows.mdwn
  • /doc/first_steps/additional_software.mdwn
• Test rsync command in doc/first_steps/persistence/rescue.mdwn (@cbrownstein)
• Remove mentions to Passwords and Keys
• Screenshots (@sajolida)
  • /doc/first_steps/welcome_screen/password-prompt.png
  • /install/inc/screenshots/gnome_disks_menu.png
  • /install/inc/screenshots/gnome_disks_drive.png
  • Update to new top navigation bar
    • keyboard.png
    • tor-status.png
    • accessibility.png
  • Update to Activities
    • favorites.png
    • tails-in-vm.png
    • places.png
    • applications.png
    • desktop.png
    • disks-menu.png
    • US_calendar_in_Russian.png
  • Update to new system menu
    • system.png
    • system-without-wifi.png
  • Update to time in GMT
    • time-sync.png
    • mac-spoofing-disabled.png
    • add-additional-software.png
    • remove-additional-software.png
  • VeraCrypt instructions
    • disks-menu.png
    • container-locked.png
    • partition-locked.png
• Misc
  • Remove DocBook classes on everything we touched
  • Update PO files
  • Check translation stats before and after
• wiki/src/doc/first_steps/additional_software.mdwn gives a Buster-based example