Previously, the citation js would load every time when opening a citable
repo. Now it only loads when the user clicks the button for it. The
loading state is representend with a spinner on the button:
<img width="83" alt="Screenshot 2024-03-17 at 00 25 13"
src="https://github.com/go-gitea/gitea/assets/115237/29649089-13f3-4974-ab81-e12c0f8e651f">
Diff ist best viewed with whitespace hidden.
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Co-authored-by: Giteabot <teabot@gitea.io>
