Use Server-Provided Jitsi Configs

[MisterRager]

Pull Request Checklist

• [x] Changes has been tested on an Android device or Android emulator with API 16
• [x] UI change has been tested on both light and dark themes
• [x] Pull request is based on the develop branch
• [x] Pull request updates CHANGES.rst
• [x] Pull request includes screenshots or videos if containing UI changes
• [x] Pull request includes a sign off