Add basic codemirror modal

[hardyjosh]

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Name	Status	Preview	Comments	Updated (UTC)
rain-frame	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 23, 2024 2:30pm

[hardyjosh]

fixes #11

[hardingjam]

Fixed the CodeMirror to have a fixed height and be scrollable - looks ready to go