fix: Rewrite admin js without jQuery

[RobertSmits]

Replace all jQuery calls with vanilla JavaScript, as Nextcloud 34 has no support for it.
Fixes #58

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI

[LePiegro]

Any news on this? We really need it!

@RobertSmits seems like your commit was not signed off, maybe they are waiting on that?

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[LePiegro]

@juliusknorr This fixes jQuery removal for NC 34 (#58) and is blocking us. The commit is signed off (2716a7a) and CI is green — could you review and merge?

[branddavid]

Hi, When do you think the app will be compatible and available in the Store?

[Netzarea]

We are also waiting for the update so that we can finally update our customers instances that use this plugin to Nextcloud 34. When can we expect it to be compatible?

[user8446]

Please review and merge... upgrading to 34 broke a lot of things, thank you!

[arnowelzel]

I can confirm that this patch works for Nextcloud 34. If you don't want to wait, you can force install Custom CSS and then replace apps/theming_customcss/js/settings-admin.js with the patched version from this pull request:

https://raw.githubusercontent.com/RobertSmits/theming_customcss/2716a7ae0060cce34f9617165e6bdbaff941d588/js/settings-admin.js