Add syntax highlighting to code blocks

[hughess]

Before

After

Potential Issues

• Styling issues - @apply wasn't working, so for now I've had to override styles in the html tag
• Uses a slightly modified definition of Svelte syntax from svelte-prism rather than importing from that library
• Prism themes not working, stuck on default styling
• Import method for languages may not be ideal

Checklist

• [x] For UI or styling changes, I have added a screenshot or gif showing before & after
• [x] I have added a changeset
• [ ] I have added to the docs where applicable
• [ ] I have added to the VS Code extension where applicable

To do before merge

• [ ] Remove document usage in reactive statement
• [ ] Confirm import method for languages and Prism
• [ ] Clean up styling conflicts
• [ ] Set appropriate margins/padding on code box
• [ ] Add a language option for evidence so users can include documentation in their project without having to know about svelte

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 5992bca4e984bdb0639a90425cfd9e392fc98b44

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
@evidence-dev/preprocess	Patch
@evidence-dev/core-components	Patch
@evidence-dev/evidence	Patch
@evidence-dev/components	Patch
my-evidence-project	Patch
evidence-test-environment	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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[mcrascal]

Not sure why this doesn't build, but I took a look at the @apply issues. Apply works in the component, but it seems like it was conflicting with the mix of inlined styles and classes. I've opened a PR (#1955) that just converts it to normal tailwind.

[hughess]

Ah it turns out there was a document in there breaking the build. Hopefully got a fix for that