Add versioning to the documentation

Summary

It would be really awesome to have the docs versioned. Nearly all software projects I know have the docs versioned, so you can get the docs to a specific release.
Currently there is no real chance to get an old version of the docs.

Basic Example

_No response_

Motivation

If I run an old version of directus I want to have the docs for this version, not the latest version.
Especially for breaking changes it is really good to be able to see how things worked before.
Also of you are doing updates it is really helpful to check the old docs to see when things changed.

Detailed Design

The source of the docs is already versioned, even if there is only a very short history, because of some migrations.

Requirements List

Must Have:

• Version selection in the rendered docs


Drawbacks

None

Alternatives

Search the docs source code, which is terrible to do.

Adoption Strategy

Everybody will be happy.

Unresolved Questions

_No response_