Package branding-alt-workstation: Information

- browser-qt: replace logo_width.png with smaller size
- gnome-settings: add software-installation-priority override
- gnome-settings: remove primary-monitor=0

- Use substitution @BRANCH@ (thx antohami@alt)
- Revert mate-settings subpackage (thx antohami@alt)
- gnome-settings, mate-settings: use jpeg image
  for background (thx antohami@alt)
- add Qt6 support
- browser-qt: add width distr logo
- browser-qt: fix the movement of checkboxes when pointing
- indexhtml: move technical support link to Basealt column and add
  technical support url to en page
- indexhtml: fix title in EN page

- browser-qt: fix checkbox style issue
- os-release: add DOCUMENTATION_URL, SUPPORT_URL, ALT_BRANCH_ID
- gnome-settings: remove favorite-apps from appearance setup, add
  gnome-software and reorder position
- gnome-settings: enable appindicator and clipboard in gnome-mode by default