Add val-town-playground

[maxmcd]

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Deploying val-town-docs with    Cloudflare Pages

Latest commit:	d523f3e
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Preview URL:	https://f156ea24.val-town-docs.pages.dev
Branch Preview URL:	https://add-val-town-playground.val-town-docs.pages.dev

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[maxmcd]

paused on this for a moment as I try and figure out why the shadow dom is leaking styles and the text is showing up v light:

[pomdtr]

I mirrored the setup (entry in the head section of the astro config) in #146, so we can probably close this.