Extend https://github.com/go-gitea/gitea/pull/21432 to commit messages. Color is changed because the markup code block bg does not offer enough contrast on varying backgrounds. <img width="568" alt="Screenshot 2024-03-27 at 19 52 55" src="https://github.com/go-gitea/gitea/assets/115237/ddc9307e-f32f-4e97-8b88-91f88ced2a36"> <img width="573" alt="Screenshot 2024-03-27 at 19 53 33" src="https://github.com/go-gitea/gitea/assets/115237/14b30fd2-bf28-46b8-9e82-eb60a28f6bf2"> <img width="422" alt="Screenshot 2024-03-27 at 19 53 01" src="https://github.com/go-gitea/gitea/assets/115237/a12136b5-c02b-460c-9830-f830542987ae"> <img width="397" alt="Screenshot 2024-03-27 at 19 53 27" src="https://github.com/go-gitea/gitea/assets/115237/c9f05d81-c73e-468e-98e9-e5929bc0da3e"> <img width="333" alt="Screenshot 2024-03-27 at 19 53 07" src="https://github.com/go-gitea/gitea/assets/115237/06b5a9f9-f95d-46b6-8c57-df0b02555652"> <img width="279" alt="Screenshot 2024-03-27 at 19 53 21" src="https://github.com/go-gitea/gitea/assets/115237/b06a0afc-ddd8-48ae-b557-a6dc47802e68">
