feat: github action to integrate/publish endo and agoric-sdk reference docs too

[LuqiPan]

This PR will make reference docs for both endojs/endo and agoric/agoric-sdk repos available on docs.agoric.com.

Some finer prints:

• to update the git hashes of repos we're generating docs from, run yarn git:update-submodules
• deployment time is around 8 minutes vs 2 minutes prior to this change
• I had to use a hack to make it build successfully on Cloudflare

[cloudflare-pages[bot]]

Deploying documentation with    Cloudflare Pages

Latest commit:	ba4232f
Status:	✅  Deploy successful!
Preview URL:	https://97e1e3c9.documentation-7tp.pages.dev
Branch Preview URL:	https://927-reference-docs-in-search.documentation-7tp.pages.dev

View logs

[github-actions[bot]]

Cloudflare Pages Preview URL: https://3c691980.documentation-7tp.pages.dev

[github-actions[bot]]

Cloudflare Pages Preview URL: https://40e7b3f7.documentation-7tp.pages.dev

[dckc]

we will lose the lovely cloudflare-pages bot and its handy comment and links

That is a big loss.

We seem to still get comments with preview links: https://github.com/Agoric/documentation/pull/1038#issuecomment-2024063931

It seems to only provide per-commit preview links and not per-branch links that update with new commits. I'll miss that. But I think I can deal.

[LuqiPan]

Update:

We're going to submodules and back to build with Cloudflare (and thus Cloudflare Pages bot is working again), PR description updated too

[turadg]

Cloudflare Pages bot is working again and we're using submodules now. Let me know if you have additional comments, but for now I'm optimizing for getting this PR merged in.

👍