Overhaul documentation #332
Description
The documentation of rascaline is a bit lacking, and should be improved quite a lot. This will be a meta issue to list everything that needs to be done:
- re-organize the different pages to make navigation easier
- Document the convention used for metatensor labels #302
- Add a tutorial about "how to get fixed size output from rascaline" #310
- Add explanation section on how we compute radial integrals #299
- How-to on explaining what each calculator is doing #164
- Add back "SOAP hyper explanations" tutorial that was removed in Update hyper-parameters to a more extensible schema #328