Readme on unpkg; tailored for MapLibre GL JS

[roblabs]

Launch Checklist

• briefly describe the changes in this PR

• This PR adds notes on unpkg; tailored for MapLibre GL JS.
• This is useful for developers that want to fetch via unpkg a specific version (give me 1.14.0), or at least versions (give me at least 1.14.x), or latest.
• Developers can also fetch release date, size and CHANGELOG for any version using these notes on unpkg.

• confirm your changes do not include backports from Mapbox projects (unless with compliant license)
• apply changelog label ('bug', 'feature', 'docs', etc) or use the label 'skip changelog'
• add an entry inside this element for inclusion in the maplibre-gl-js changelog: add readme on unpkg versions
• write tests for all new functionality.

• Tested unpkg links in the readme including semver, meta

N/A:

• include before/after visuals or gifs if this PR includes visual changes
• document any changes to public APIs
• post benchmark scores
• manually test the debug page

[github-actions]

Bundle size report:

Size Change: 0 B
Total Size Before: 205 kB
Total Size After: 205 kB

Output file	Before	After	Change
maplibre-gl.js	196 kB	196 kB	0 B
maplibre-gl.css	8.87 kB	8.87 kB	0 B

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[wipfli]

Thanks for this @roblabs. Maybe we could add this information here as well: https://maplibre.org/maplibre-gl-js-docs/api/ ?

[roblabs]

Thanks for this @roblabs. Maybe we could add this information here as well: https://maplibre.org/maplibre-gl-js-docs/api/?

Great idea @wipfli!! I've added PR maplibre/maplibre-gl-js-docs#46. I think the API Docs are a better landing page & summary of how UNPKG is used. I'll keep this README here in this repo, as it can be used for local docs for JS developers.