Recognize org-mode .org files as text files and allow collaborative edition like for .md and .txt files

[bzg]

Steps to reproduce

1. Share an .org file with others through a Nextcloud instance (latest version)
2. Try editing it collaboratively
3. See that you cannot

Expected behaviour

Users should be able to collaboratively edit .org files as plain text files, the same way they edit .txt and .md files.

Actual behaviour

They cannot.

[juliusknorr]

For collaborative editing please see the text app, especially https://github.com/nextcloud/text/issues/394 for org files.

The plain text editor doesn't support collaborative editing, but opening org files would still make sense here i guess.

[bzg]

Thanks, I will follow the discussion there!