Update link to Commands documentation
The previous link pointed to the Markdown file, but the links are broken on that page. This pull request points to the actual documentation.
Grabbed from PR to help the merge process.
@@ -106,7 +106,7 @@ Information on how Podman configures [OCI Hooks][spec-hooks] to run when launchi
**[Podman API](API.md)**
Documentation on the Podman API using [Varlink](https://www.varlink.org/).
-**[Podman Commands](commands.md)**
+**[Podman Commands](https://podman.readthedocs.io/en/latest/Commands.html)**
A list of the Podman commands with links to their man pages and in many cases videos
showing the commands in use.
