v21.05.3-ls150

LinuxServer Changes:

Rebase to Alpine 3.14.

bookstack Changes:

Links

• Update instructions

Full List of Changes

This release contains the following fixes and changes:

• Added a "Skip to content" link as first page focus item for accessibility use. (#2810)
• Updated social account detachment to have CSRF protection. (#2808)
• Updated PHP dependency versions.
• Fixed issue where translations system may attempt to load from the root directory when a theme was not in use. (#2836)