Docs updates for new Codeblock v3 docs

[ethanpalm]

Documentation changes

Documents all meta features available with new code blocks.

Closes

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

[dks333]

we have added support for all languages listed here in shiki docs, we should remove our current list and just add a reference to this link

[handotdev]

Recommend adding something to note that for all features, they need to have language set first. It doesn't work when it's like this directly

```title="Title"
Code
```

[ethanpalm]

Great point. I made all the options H3s under an H2 for code block options to introduce this information and make it more clear that these options only apply to code blocks. It should be apparent that you can't style inline code, but this makes it more direct.