Documentation improvement suggestions

[eero-t]

• 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