* First pass at tidying up auth docs.
Rearranged some of the images to enhance the flow and reorganised some
of the steps for setting up MFAs.
Submitting this as WIP for pull request.
* Some more cleanup and changes to the text, mostly for clarity (IMHO).
This should be all that is required for the moment, but some more info on
Trusted Networks would be useful. I had a few subtle issues setting that
up regarding proxies so I'll look at adding that if I figure out how to
explain it succinctly.
* ✏️ Tweaks
* ✏️ Tweaks
* ✏️ Tweaks
* Update note about default auth_providers
Update the warning note to specify that HA automatically configures auth_providers, and manually specifying auth_providers in configuration.yaml can cause issues
* Minor changes
