Selected version download

### Is your feature request related to a problem? I had to backport a bug fix to an older version of two of my plugins and now those versions are counted as latest, which might cause confusion or even problems. ### Describe the solution you'd like. The main download button on the project overview page should prompt you for the minecraft version you want to download the plugin for ### Describe alternatives you've considered. Unpinning the version by hand, but that doesn't work if "latest version is pinned on main project page" is enabled ### Other _No response_