BigBlueButton Integration v1.3.0

Added

• #124 make navigation label configurable
• bump Nextcloud version

Fixed

• do not register file action without authentication
• always show missing configuration message
• #125 prevent group restriction
• psalm errors
• translate settings header
• increase qr code error correction
• adapt restriction table to common style

Misc

• add link to contributor guide
• use psalm
• add admin screenshot
• move to github actions