Active learning tutorial (#1589)

* [docs] create active learning tutorial and diagram

* [docs] rewrite ML setup doc to complement the active learning tutorial

* [docs] update create ML backend with info about self.model

* [docs] Review feedback restructuring

* [docs] review feedback restructuring

* [docs] Update for review feedback

* [docs] Update for review feedback on manual vs automated AL

* [docs] review feedback

* [docs] update webhook info

* [docs] Update image with a less complex one for now

* [docs] Fix graphic sizing

* Make webhooks as an optional step

* [docs] Update webhook step

Co-authored-by: nik <nik@heartex.net>