Provide documentation "latest" or "stable" docs alias for use with objects.inv

[JAEarly]

I'd like to integrate the rerun Python sdk docs into my own project using mkdocs autorefs. While rerun currently publishes objects.inv, it is versioned, e.g. https://ref.rerun.io/docs/python/0.23.3/objects.inv. This means I will have to manually bump the docs links each time I update the repo.

In contrast, other repos provide a stable or latest alias that always points to the most recent published version, e.g. https://numpy.org/doc/stable/objects.inv. Rerun does provide https://ref.rerun.io/docs/python/main/objects.inv, but that is going to be bleeding edge rather than stable.

[Wumpf]

Interestingly enough everything else works with stable. E.g. https://ref.rerun.io/docs/python/stable/common/archetypes/#rerun.archetypes.Points3D