Feature: refactor `Contributors` grid view

[zeucapua]

Suggested solution

The Contributors component used in /explore, /workspaces/<id>/contributor-insights, and the upcoming /s/<org>/<repo>/contributors page has two views, "list" and "grid". The "grid" view is 3 components deep, with redundant hook calling. "List" (aka table) view will be refactored in another issue.

Needed for #3342

Visualized below:

• Orange: components that call hooks
• Light Red: functions that wrap a hook
• Blue: hook (using useSWR to fetch the API)
• Yellow: Component snippet (doesn't call hooks and has their own file)
  • Note: these components aren't used outside of the Contributors component scope

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