Missing redirects from current version URLs to version-less URL

[jandubois]

The URL for any other version is created by including the version string, e.g.

https://docs.rancherdesktop.io/next/references/architecture/

To access the current version of the docs from inside the application, we would need to reference it like (1.6.1 should really be 1.6, see #117):

https://docs.rancherdesktop.io/1.6.1/references/architecture/

This URL currently gets a 404, but should have redirected to

https://docs.rancherdesktop.io/references/architecture/