[chore] Old layout cleanup

[bpander]

Description

1. Fixes old layout header + footer by just reusing the astro versions. Removes now unneeded code.
2. Removes a committed stripe public key, which has never been used anywhere in this repo.

The primary motivation for this is to alleviate my OCD but it'll also somewhat help with GRO-688. We'll probably stop building old versions every deployment, which means some stuff will need to be updated so it renders client-side (e.g. the copyright year, references to the latest version, etc); it simplifies things by only having one header+footer to deal with.

This only affects REALLY old version (like 36 and below) and it's not insane to think we'll completely retire those versions from the docs site, but that's a bigger conversation. And this does a big chunk of that work anyway.

Also, we'll probably purge unused CSS from this repo soon, and I think it'd be good to remove this old code before we do that (in case it means we can purge even more unused CSS).

How to test

This should be pretty low risk. It mostly removes a bunch of includes. If they were needed, the build would fail.

Just spot-check a few pages and the nav on some old versions like http://localhost:4321/docs/v0.36 and some new versions.

Demo

https://www.loom.com/share/8ee13246db4a4bbb90b9b9906a3d4012

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Status	Name	Latest Commit	Updated (UTC)
❌ Deployment failed View logs	metabase-docs	22cba0e	Sep 03 2026, 05:24 PM

[gantoreno]

Gotta love removing a bunch of unused code, nice!