editor: migrate from TinyMCE to HugeRTE MIT fork

[mirekys]

❤️ Thank you for your contribution!

Description

Replaces TinyMCE with HugeRTE, an MIT-licensed fork, to avoid the GPL/commercial licensing of TinyMCE 7+. Updates all imports, package dependencies, API should be compatible with TinyMCE v6 (should be a drop-in replacement).

Starting with TinyMCE 7, we'd otherwise have to decide whether to go with commercial or GPLv2+ license,
which I think is a no-go for this project, see:
https://www.tiny.cloud/docs/tinymce/latest/license-key/

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• I'm aware of the code of conduct.
• [x I've created logical separate commits and followed the commit message format.
• I've added relevant test cases.
• I've added relevant documentation.
• I've marked translation strings.
• I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
• I've NOT included third-party code (copy/pasted source code or new dependencies).
  • If you have added third-party code (copy/pasted or new dependencies), please reach out to an architect on Discord.

Frontend

• I've followed the CSS/JS and React guidelines.
• I've followed the web accessibility guidelines.
• I've followed the user interface guidelines.

Reminder

By using GitHub, you have already agreed to the GitHub’s Terms of Service including that:

1. You license your contribution under the same terms as the current repository’s license.
2. You agree that you have the right to license your contribution under the current repository’s license.