v0.56.0-beta release

This is a beta release. No database or sync changes.

• codemirror updated to 5.65.9
• ckeditor updated to 35.2.1
• update pwa manifest support deploy in sub folder #3199
• fix of Edit button not refreshing correctly upon note type/mime change
• fix toc with > 10 items on the same level, closes #3182
• support basic auth in ETAPI
• improved error handling of wrong port configuration, #3177
• added "#color" label support for notes
• reference links now contain note's icon
• Update docker-compose sample to use node user home dir and pull directly from docker hub #3161
• fix hidden backlinks, closes #3158
• 0 offset of context menu, fixes #3157
• improve "open" button behaviour for files when in browser #3153
• fix deleting / erasing note