1.9.0: Styling Tweaks and Small Fixes

For Firefox/Librewolf v131

Features added:
- Better styling for "big pinned" tweak
- Added borderless no round option
- Don't warn on about:config open
- Urlbar floating adapts better to smaller width windows
- Window translucency works better on macos

Bugs Fixed:
- Urlbar focused background set incorrectly on windows/macos
- Urlbar input font size when floating not set correctly
- Urlbar centered text when not floating not working
- Inconsistent top and bottom margin with hovered sidebar when borderless #23
- Extension badge colors not set correctly when not using firefox color
- Sidebar translucent bg not working with no round tweak

Documentation changes:
- Add better solution for wrong content bg #22
- Update Nix example to match `user.js`
- Fix CC BY-SA link in README

artifacts