feat: remove outdated documentation and fix overlay issue in SkipController

- Deleted SKIP_CONTROLLER_TEST.md and SKIP_CONTROLLER_UPDATE.md as they are no longer relevant.
- Removed SKIP_FEATURE_GUIDE.md to streamline user documentation.
- Eliminated SKIP_OVERLAY_FIX.md after addressing the click offset issue caused by the SkipController overlay.
- Improved user experience by ensuring the SkipController does not interfere with episode selection.

Author: katelya77