website/integrations: Add documentation for Drupal #28877

Job	Run time
test-unittest	3m 34s
lint-golint	1m 38s
ci-outpost-mark	3s
build-container (proxy)	3m 15s
build-binary (proxy, linux, amd64)	1m 56s
build-container (ldap)	2m 18s
build-binary (proxy, linux, arm64)	2m 0s
build-container (radius)	2m 19s
build-binary (ldap, linux, amd64)	2m 10s
build-container (rac)	2m 18s
build-binary (ldap, linux, arm64)	1m 54s
build-binary (radius, linux, amd64)	1m 55s
build-binary (radius, linux, arm64)	2m 14s
build-binary (rac, linux, amd64)	1m 59s
build-binary (rac, linux, arm64)	1m 57s
	31m 30s

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