Add image/information to our dockerhub repo

[dfreilich]

The Cloud Native Buildpacks Docker Hub repos (buildpacksio and (cnbs)(https://hub.docker.com/u/cnbs)) look pretty sketchy. cnbs is understandable, given that it seems like we only host sample/internal images (though we do reference it in our docs), but given that buildpacksio is a bit more external (we will soon be referring to it in our tekton task (tektoncd/catalog#434), and it is our "official" lifecycle/pack image), we should probably spend some effort making it a bit more trustworthy.

Some potential tasks may be:

• Add our logo for both cnbs and buildpacksio
• Add a description/logo to buildpacksio/lifecycle
• Add a description/logo to buildpacksio/pack

[jromero]

@samj1912 could you break this up into multiple issues in their respective repos?