- Add release notes detailing the upgrade process from Qt5 (v0.9.10) to Qt6 (v0.9.11).

- Restrict configuration and profile file permissions to enhance security.
- Update CI pipeline to drop support for older distributions and add placeholders for KF6-compatible builds.
- Remove KF5 KRunner plugin and update `control` file to reflect compatibility changes.
- Update README with detailed upgrade instructions and supported distribution information.
- Ensure alignment with Qt6 and updated dependencies in documentation and build configurations.