Allow access to previous versions

[marcelomrwin]

On the crc download portal https://console.redhat.com/openshift/create/local it is not intuitively possible to download previous versions.

In the event of a problem arising from updating to a new version, I consider it extremely important that users can go back and download the previous version.

In fact, if the user is a little smarter he will be able to get to the https://mirror.openshift.com/pub/openshift-v4/clients/crc/ link but this is not intuitive.