Document the new upstream OAuth 2.0 configuration options #1237

Job	Run time
Lint and test OPA policies	7s
Check frontend style	49s
Run the frontend test suite	51s
Check Rust style	12s
Run `cargo deny` checks	27s
Check schema	4m 38s
Compile test artifacts	4m 16s
Check syn2mas	13s
Run Clippy	2m 27s
Run test suite with Rust stable (1)	2m 5s
Run test suite with Rust stable (2)	2m 2s
Tests done	4s
	18m 11s

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