Document stages and jobs.

docs/gitlab/drupal/index.md

@@ -345,6 +345,32 @@ Rules, when the job should run:
 
 - the tests are enabled by `$DISABLE_CI_TESTS` != "1"
 
+### Deploy
+
+This stage handles the deployment of the produced build artefact.
+
+#### Deploy
+
+The following jobs must run before successfully:
+
+- [Build Prod Site](#build-prod-site)
+- [Build Theme](#build-theme)
+
+This job executes an [Ansible](https://www.ansible.com/) script, which does the deployment.
+
+Rules, when the job must not run:
+
+- `$DISABLE_DEPLOYMENT` != "0"
+- `$DISABLE_DEPLOYMENT_LOCAL` != "1"
+
+#### Deploy NG
+
+The following jobs must run before successfully:
+
+- [Build Prod Site](#build-prod-site)
+- [Build Prod Site NG](#build-prod-site-ng)
+- [Build Theme](#build-theme)
+
 ### Internal Stages
 
 Here we have some internal stages, which cannot be executed alone. The purpose is to