This PR hide the pull request merge box totally if it's merged and branch deleted. It's also add a bold for merge base commit id in merged message comment Before: <img width="989" alt="图片" src="https://user-images.githubusercontent.com/81045/235066590-28deb506-e824-4a42-a9a2-791cd136756e.png"> After: <img width="1030" alt="图片" src="https://user-images.githubusercontent.com/81045/235080749-11d5efe8-a06e-4528-a75f-f6c6d191db50.png"> --------- Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
