Optimize repo-list layout to enhance visual experience (#31272) (#31276)

Optimize repo-list layout to enhance visual experience (#31272) (#31276)

Backport #31272 by @kerwin612

before:

![1717655078227](https://github.com/go-gitea/gitea/assets/3371163/4d564f96-c2f8-46b1-996f-6cc7abb940ef)
***The problem was that the icon and text were not on a horizontal line,
and the horizontal was not centered;***

after:

![1717655094071](https://github.com/go-gitea/gitea/assets/3371163/b11797f6-05f8-486c-b5fd-df89d0cbdcfd)

Co-authored-by: Kerwin Bryant <kerwin612@qq.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>