DOC, DX: Remove version warning banner in latest version

[melissawm]

Reference issue

Addresses #19699 (comment)

What does this implement/fix?

Do not include the version warning banner at the top of the pages on "latest".

If I understand the docs release process correctly, once the docs are built for stable, the version warning banner code will be present so that:

• stable (1.12.0) won't show any banners, but the banner code will be included in the build;
• once 1.12.X is released, 1.12.0 will show the banner.
• "latest" will never show the banner.

Additional information

Perhaps @tylerjereddy can confirm the docs building/release process.

[lucascolley]

not sure if the refguide-check timeout is related but it shouldn't be

[rgommers]

Thanks @melissawm, and thanks for the review @lucascolley. This LGTM, so let's give this a go.

If I understand the docs release process correctly, once the docs are built for stable, the version warning banner code will be present so that:

That sounds right to me.

not sure if the refguide-check timeout is related but it shouldn't be

I reran it just to check if it would time out again, but it didn't That job is downloading data files with pooch, which is the most likely cause of timeouts in the middle of the checker running.