cubicweb-forge #2450678 Show publishing dates [open]

On old projects, it is not immediattly visible when the last release date or activity was done.

Display :

  • publication date next to Download tgz
  • publication date in "roadmap" tab next to "latest published version"
  • display last commit date in "project info" tab.
done in<not specified>
closed by<not specified>