Remove <!-- copyeditor --> comment from rendered docs

[flother]

Currently, on the Sprite page of the Maplibre Style Spec docs, an HTML comment is being rendered as text:

When the Markdown is rendered as HTML the < in <!-- copyeditor ignore retext-passive --> is being escaped as < and so the comment is appearing in the docs. The comment is probably some leftover debris from when https://npm.io/package/@mapbox/copyeditor was being used (pre-fork?). It's the only instance of a <!-- copyeditor --> comment in the docs, and so it seems the safest/easiest thing to do is simply remove it.

Launch Checklist

• Confirm your changes do not include backports from Mapbox projects (unless with compliant license) - if you are not sure about this, please ask!

[HarelM]

This looks good. Thanks!
In the past there were a few images in this page to explain the stretch part of the shields.
@birkskyum so you know what happened to those? Can we bring them back?

[birkskyum]

Thank you @flother .

@HarelM , I unfortunately don't remember these pictures. Maybe we can find an old version of the docs that has them still.