New Utility: CodeBlock

[endigo9740]

The Skeleton documentation has been using the <CodeBlock> component internally for a white. I believe it's adequately mature now. Let's go ahead and document this and make available as part of the library.

This will include the following changes:

• Add Utilities > Code Blocks to the Skeleton docs navigation
• Minor updates to the CodeBlock documentation, including instructions for setting up Highlight.js
• Add the CodeBlock component to the package exports in /lib/index.js

[endigo9740]

@thomasbjespersen This is now ready for QA. Thanks!

[thomasbjespersen]

@endigo9740 Any reason why you are not specifying HTML as lang in the usage section, and instead using plaintext?

<CodeBlock code={'...'}></CodeBlock>

[endigo9740]

@thomasbjespersen I see what you mean, Highlight.js wasn't properly highlighting the inner CodeBlock snippet because of the Svelte syntax. They support a ton of languages but unfortunately Svelte is not yet one of them.

https://highlightjs.org/static/demo/

[thomasbjespersen]

@endigo9740 I think I get what you are saying.. Lets leave this as is..

[thomasbjespersen]

We are good to merge this branch to master, @endigo9740.