[WIP] Swap in codemirror for prism

[zchrykng]

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Description

Fixes #105 by swapping out the prism editor for vue-codemirror. I know this is a work in progress, but I'm submitting the pull request so that more eyes can be on it as I make progress.

This is my first time working with Vue, so I apologize in advance for any beginner mistakes.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• User interface (UI)

Checklist

• My code follows the style guidelines of this project
• I ran ESLint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas
  (including JSDoc for methods)
• My changes generate no new warnings
• My code needed automated testing. I have added them (this is optional task)

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