Changelog

Fixed a code execution vulnerability (#8) with notebook names/page names. This could only happen if you typed in a malicious name yourself or downloaded a save.json file from someone else and put it in your save directory.
Using a code block with the "other" language doesn't freeze the editor anymore and highlights properly (#9)
The code language overlay now doesn't show if there's no language/other
Added menu options and macros for Nim and OCaml (macros: [nim] and [ocaml])
Added a section in the "Basic Editing" doc about how to paste in images

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