Layout fixes / declutter the configuration options #15041

Job	Run time
Set up docker build 'dynamic' env variables	1s
Build and check documentation	3m 3s
End-to-end tests, chromium	13m 50s
End-to-end tests, firefox	16m 42s
Run the Django test suite	7m 53s
End-to-end tests, webkit	12m 19s
Run the Django test suite in reverse	5m 30s
docker_build (production) / Build image	2m 47s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 41s
Simulate upgrading instances (2.8.2)	1m 19s
Scan docker image	2m 23s
Check for unexepected OAS changes	4s
Validate OAS	13s
Generate Postman collection from OAS	13s
Generate SDKs from OAS	31s
Push Docker image	0s
update-docker-readme	0s
	1h 9m 29s

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