Minor tweaks to repo topics:
- Use gap instead of margin to align "Manage Topics" when no topics
present
- Add margin to description instead
Before:
<img width="1232" alt="Screenshot 2023-07-08 at 13 08 15"
src="a5d3586c-6cbf-4b74-8137-11d91f2cbb45">
<img width="1233" alt="Screenshot 2023-07-08 at 13 08 05"
src="59b18d93-e4cb-4f2b-9bc2-d6aa63f93827">
After:
<img width="1232" alt="Screenshot 2023-07-08 at 13 08 42"
src="470d42ad-3f7e-40f9-b0a1-203b4af77eb9">
<img width="1231" alt="Screenshot 2023-07-08 at 13 08 32"
src="42d18048-748c-4a3f-ab89-3403866cef34">
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