* Add API Permissions to the app registration setup
* Encouraged re-use of an existing app registration over creating a new one.
* Moved the `Adding the provider to the Backstage front end` higher up so it's not so easily missed
Updated the microsoft authentication document to include details on adding API Permissions.
At more relaxed companies, these permissiosn will be silently added to this list the first time they're requested, however in more locked down companies, a directory admin will need to consent to these permissions before users can use them.
Also slighlty reworked the docs to encourate re-using any existing app registration. This includes renaming the `AUTH_MICROSOFT_*` variables to match the `AZURE_*` ones used throughout other azure integrations.
Signed-off-by: Alex Crome <afscrome@users.noreply.github.com>
Alex Crome
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