### Gitea Version docker images: gitea/gitea:1.15.10 ### Git Version _No response_ ### Operating System CentOS7 for host os ### How are you running Gitea? docker-compose ### Database PostgreSQL ### Can you reproduce the bug on the Gitea demo site? No ### Log Gist _No response_ ### Description When a mermaid markdown is added to issue or README.md, it does not render as expected. It can render normal in try.gitea.io. BTW: my gitea server upgraded from 1.4.x step by step. ### Screenshots write in issue or README.md  but cannot render 