Linik to pre-build firmware is broken in readme

Link to [Releases](https://github.com/ClemensElflein/CoverUI/blob/main/releases) is broken in the [Firmware binaries](https://github.com/ClemensElflein/CoverUI/blob/main/Firmware/CoverUI/YardForce/README.md#firmware-binaries) section.

Would be nice to keep providing pre-build assets.