[discourse-gatekeeper] Migrate charm docs #1310

Job	Run time
integration-tests / Plan	6s
integration-tests / Build charm (jenkins-k8s)	9m 25s
integration-tests / Build rock (jenkins)	3m 22s
integration-tests / Plan Image Scanning	5s
integration-tests / Integration tests / Integration tests (test_auth_proxy.py)	29m 20s
integration-tests / Integration tests / Integration tests (test_cos.py)	22m 20s
integration-tests / Integration tests / Integration tests (test_ingress.py)	11m 44s
integration-tests / Integration tests / Integration tests (test_jenkins.py)	12m 27s
integration-tests / Integration tests / Integration tests (test_k8s_agent.py)	23m 36s
integration-tests / Integration tests / Integration tests (test_machine_agent.py)	14m 19s
integration-tests / Integration tests / Integration tests (test_plugins_part_1.py)	18m 49s
integration-tests / Integration tests / Integration tests (test_plugins_part_2.py)	16m 35s
integration-tests / Integration tests / Integration tests (test_proxy.py)	10m 27s
integration-tests / Integration tests / Integration tests (test_upgrade.py)	11m 31s
integration-tests / Integration tests / Integration tests (test_external_agent.py)	15m 25s
integration-tests / Scan Image (ghcr.io-canonical-jenkins-46499b77ce3a525fd8366c7e0fc694a8234c53dd-_1.0_amd64.tar)	1m 3s
integration-tests / Required Integration Test Status Checks	1s
	3h 20m 35s

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