Changing version on a not-found page redirects to the 404 page for that version instead of that version's page.

[Proggle]

Issue description: I was having an issue implementing something in godot 3, and was reading a thread about it. I clicked a link someone gave to documentation about rigid bodies ( https://docs.godotengine.org/en/stable/classes/class_rigidbody.html? )

This class page no longer exists in godot 4's documentation , so I got a '404' page, which said "Sorry, we couldn't find that page. It may have been renamed or removed in the version of the documentation you're currently browsing."

So I clicked on the 'version' thing to try to change versions to godot 3.

Unfortunately, the version change links for 'not found' pages don't link to the correct place - if I click '3.6', it should link to https://docs.godotengine.org/en/3.6/classes/class_rigidbody.html . Instead, the links take you to the 404 page for that version ( https://docs.godotengine.org/en/3.6/404.html ). This is very unhelpful.

This should be changed, to make it easier to access v3 documentation links which had 'stable' in them when they were given.

[YuriSizov]

This seems to be a bug with ReadTheDocs. We don't have control over where these links lead, as this panel is generated by ReadTheDocs themselves. We could add something to the contents of the page itself though.

In the meantime, you can edit the address and replace stable with the version number you desire.

[Proggle]

I'll post it to their issue tracker then. In the meantime, putting a dropdown on the 404 page would be helpful, assuming it knows what page it's trying to access.