Do not link to specific extension release version in documentation

[sinui0]

Right now we link to a specific version of the extension. We should instruct the user to download the latest version otherwise it will become a headache to keep the documentation in sync.

[heeckhau]

That is indeed where we need to end up eventually.

But for now, I think it's better to use explicit versions. That way, it's clear for which version the documentation is written.
If you agree, I would even use the explicit release tag in the git clone command (instead of the default dev branch)

[sinui0]

Another approach would be to host multiple versions of our docs and stick with the explicit versions as you suggest.