[BUG] Broken links in main MicroShift README

[oglok]

The "Deployment models" section has two links that are broken:

• Install as a container via Podman, utilizing cri-o runtime and be lifecycle-managed by systemd
• Run an all-in-one microshift deployment on which devs can test their applications locally.

[cooktheryan]

Will patch upon merging of microshift-io/microshift-documentation#39