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Backport #25292 by @silverwind Save another 50KB of CSS by removing unused and useless Fomantic variants. Removed the last instance of a `tertiary` button and fixed a TODO: <img width="509" alt="Screenshot 2023-06-15 at 22 34 36" src="https://github.com/go-gitea/gitea/assets/115237/8a16ae7b-2b17-439b-a096-60a52724e3d6"> Co-authored-by: silverwind <me@silverwind.io>