* Docs: Fix broken links in main for 1.10 release
* Implement Tim's suggestions
* Remove link to Portworx from ecosystem page
* remove "Portworx" since Portworx 3.2 no longer supports Nomad
This PR modifies references to the envoyproxy/envoy docker image to
explicitly include the docker.io prefix. This does not affect existing
users, but makes things easier for Podman users, who otherwise need to
specify the full name because Podman does not default to docker.io