Documentation improvement suggestions

* Project is missing description: https://github.com/intel/containers
* Although images can be run on any distro (with suitable kernel), README includes just Ubuntu instructions: https://github.com/intel/containers#readme
* => It could refer to official documentation for other distributions: https://dgpu-docs.intel.com/
* Release (tag) descriptions are not pointing out where the corresponding "releases" (images) are found: https://github.com/intel/containers/releases/tag/20260625
* => They could e.g. list the new image names / tags and point to relevant registry: https://hub.docker.com/u/intel

Start with the project description and README linked in the issue, then inspect the release description for tag 20260625. Update the project and README documentation to cover other distributions through the Intel documentation link, and make release descriptions identify the relevant image names, tags, and registry locations.

Written by the indexing model from the issue text.