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* Add mermaid JS renderer For feature parity with GitLab. Tested in files, issues, wiki, editor. arc-green only does an inversion because the renderer seems to like to render white backgrounds on boxes. Ref: https://github.com/go-gitea/gitea/issues/3340 Fixes: https://github.com/go-gitea/gitea/issues/12307 * add feature entry, switch to neutral theme, remove border * add bindFunctions support * remove unnecessary border-radius Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com> Co-authored-by: techknowlogick <techknowlogick@gitea.io>