Uninstalling uv feels a bit hacky.

Two suggested improvements:

1. An official uninstallation script (similar to the standalone installer), or uv self uninstall.
2. If neither are realistic, improve the documentation for the manual uninstall. The current instructions first mention removing the binaries, and then mention a suggestion for removing stored data. The recommended data removal process involves uv commands that will no longer be available if the binaries are gone 😄.

Thanks!