feature request: show fork count and view forks #434

On a repo page, it would be cool to see a count of forks in the fork button, and clicking the count could lead to a page that shows forks.

Related: https://tangled.org/tangled.org/core/issues/427 (and open PR for stars https://tangled.org/did:plc:wshs7t2adsemcrrd4snkeqli/core/pulls/1112/round/3)

I imagine the design forks page would be informed by the finalized starrers page.