This commit updates the configuration for ScyllaDB documentation so that:
- 6.2 is the latest version.
- 6.2 is removed from the list of unstable versions.
It must be merged when ScyllaDB 6.2 is released.
In addition, this commit uncomments the redirections that should be applied
when version 6.2 is the latest stable version (which will happen when this commit
is merged).
No backport is required.
Closesscylladb/scylladb#21133
212eb204a7