Documentation versioning has broken links

[sashabrava]

Checklist

• [ ] I have checked the issues list for similar or identical bug reports.
• [ ] I have checked the pull requests list for existing proposed fixes.
• [ ] I have checked the commit log to find out if the bug was already fixed in the master branch.
• [ ] I have included all related issues and possible duplicate issues in this issue (If there are none, check this box anyway).

Related Issues and Possible Duplicates

Related Issues

https://github.com/celery/celery/issues/380 https://github.com/celery/celery/issues/4007

Possible Duplicates

• None

Description

If I visit page https://docs.celeryproject.org/en/latest/whatsnew-4.3.html and try to change the version of documentation, I get 404 error (generated link http://docs.celeryproject.org/en/v4.0.1/whatsnew-4.3.html doesn't look valid). The same thing happens if I visit http://docs.celeryproject.org/en/3.0/whatsnew-4.0.html and try to change on later documentation version.

I've also found some broken links over forums, let me know if you're interested.

Suggestions

Django 1.7 documentation doesn't allow me to view Django 2.2 article "What's new" since I'm on earlier versions of documentation. However, they allow to view Django 1.7 "What's new" even if I'm on Django 2.2 documentation.

Which means that limiting available documentation versions for some articles will decrease the amount of 404 pages users can get.

[thedrow]

Strange. I disabled some of them on readthedocs and I figured that they are simply removed. Maybe we should trigger a new build for them. @auvipy Can you take care of that?