Add a list of available badges to the documentation of gitlab

Please add a list of available badges to the documentation of gitlab.

Problem

The page Badges doesn't include a list of all available badges.

Solution

• Clean up the page.
• Cross-link to and from pipeline badges and project badges
• Explain the two types of badges: what they are, how + where to use them.
• Add a list of the badges we currently support.
  • https://gitlab.com/gitlab-org/gitlab/-/tree/master/lib/gitlab/ci/badge ?

  • I would love to see the badges panel split in half, with one side being the current add your own badge fields, and the other side being a list (with example graphic) of the default badges we support