Restructure documentation to make user and developer how-to's clearer.

[abbiemery]

The documentation for Blueapi is currently confusing. The page Run Auth Locally should not be in the tutorial section. This section is for users of the application. Thie page should be in the how-to's in a developer specific section. This page tells you how to run auth up with the example system test services, which is only really useful to develop against.

https://diamondlightsource.github.io/blueapi/main/tutorials/local-auth.html

Acceptance Criteria

• This page is moved out of the tutorial section
• There is some grouping or ordering of how-to's to make it clear what is useful for developing blueapi, vs using it.