[#4044] Improve dev documentation regarding forms and submissions #11779

Job	Run time
Build and check documentation	1m 50s
End-to-end tests, chromium	10m 49s
End-to-end tests, firefox	13m 50s
Run the Django test suite	7m 27s
End-to-end tests, webkit	11m 58s
Run the Django test suite in reverse	6m 2s
Set up docker build 'dynamic' env variables	1s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	7m 25s
docker_build (production) / Build image	6m 50s
Check for unexepected OAS changes	4s
Generate SDKs from OAS	33s
Validate OAS	11s
Generate Postman collection from OAS	10s
Scan docker image	2m 13s
Push Docker image	0s
update-docker-readme	0s
	1h 9m 23s

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