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I saw that their content editor looks to have better support for code editing. I'm sold

Yup - we're using rich-markdown-editor for the content editor. Full support for code and syntax highlighting. GitHub: https://github.com/outline/rich-markdown-editor, editor demo: https://rich-markdown-editor-demo.onrender.com/?path=/story/...

richmarkdown looks archived. do you know any active forks or an alternative?