[docs] WIP: Use GTM snippet

[hellendag]

Summary & Motivation

Use GTM snippet in Docs, remove GA snippet.

How I Tested These Changes

Might need to test in prod.

[hellendag]

• [docs] WIP: Use GTM snippet #16950 👈
• master

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[github-actions]

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  https://dish-docs-gtag.dagster.dagster-docs.io/integrations
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  https://dish-docs-gtag.dagster.dagster-docs.io/integrations/embedded-elt

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[hellendag]

Closing as stale, I think there was some reason we didn't pursue it. Is this still desired? I can come back to it if so.