[SE-5465] docs: add scaling deployments discovery
Description
This MR adds a discovery for scaling deployments of LMS/Studio app and celery workers, considering the CeleryBeat integration too.
Testing instructions
- Checkout this branch
- Setup a virtualenv with mkdocs
- Run
mkdocs serve
and navigate tohttp://127.0.0.1:8000
- Proofread the changes
Edited by Boros Gábor