docs: absolute url in version selector to avoid 404 errors (1 of 2)

[tbreuss]

Fixes #2832 (1 of 2 pull requests)

[dead-claudia]

Approved contingent on #2832 being merged first (and obviously, no release occuring before it). That way we can guarantee we won't have more of these to fix.

[tbreuss]

Approved contingent on #2832 being merged first (and obviously, no release occuring before it). That way we can guarantee we won't have more of these to fix.

@dead-claudia FYI: I extracted the small fix for the document generator from the big "website cleanup" branch. So we have two pull requests now, that solve the problem with 404 not found errors and can be reviewed and merged.

But, the first pull request to be merged should be #2835. The reason is, that this pull request fixes the current website too, as far as I understand the publishing and archiving process.

Then, we can merge the second pull request #2839. This fixes the issue for future releases.

So, IMHO the order should be like:

• docs: absolute url in version selector to avoid 404 errors (1 of 2) #2835
• docs: absolute url in version selector to avoid 404 errors (2 of 2) #2839

Maybe I'm wrong. But in this case the order can be changed easily.