docs: update to reflect dist folder structure

[jimniels]

What does this change?

Was trying to use the remote package and it wasn't working. For example, this was the documented URL for a theme:

https://cdn.jsdelivr.net/npm/microlighter@2/themes/github.css

But that doesn't load anything. It looks like all the assets are in dist so that URL needs to account for that

https://cdn.jsdelivr.net/npm/microlighter@2/dist/themes/github.css

Presumably the ones for node_modules are needed too, as that's how the package is installed?

Checklist

• npm test passes locally
• The size budget still passes (note any size impact below)
• Added/updated tests or the demo (docs/index.html) if behavior changed
• For a new grammar/theme, followed the steps in CONTRIBUTING.md

[davidbgk]

I was about to propose the same change :)

You probably want to update paths on docs/index.html and docs/custom-element.html too (but only in examples, not in syntax theme selector).