chore(update-mkdocs): site structure (#427)

docs/developer_guide.md

@@ -32,8 +32,6 @@ eval $(minikube docker-env)
 make all
 ```
 
-Follow [README](README.md#install) to install components.
-
 ### Changing Types
 If you're making a change to the `pkg/apis`  package, please ensure you re-run the K8 code-generator scripts found in the `/hack` folder. First, ensure you have the `generate-groups.sh` script at the path: `vendor/k8s.io/code-generator/`. Next run the following commands in order:
 ```

mkdocs.yml

@@ -20,25 +20,13 @@ nav:
   - Overview: 'index.md'
   - 'installation.md'
   - 'getting_started.md'
-  - Setup:
-      - gateways/minio.md
-      - gateways/aws-sns.md
-      - gateways/aws-sqs.md
-      - gateways/calendar.md
-      - gateways/file.md
-      - gateways/gcp-pubsub.md
-      - gateways/github.md
-      - gateways/gitlab.md
-      - gateways/resource.md
-      - gateways/slack.md
-      - gateways/storage-grid.md
-      - gateways/streams.md
-      - gateways/webhook.md
-  - 'gateway.md'
-  - 'sensor.md'
-  - 'trigger.md'
-  - 'parameterization.md'
-  - 'communication.md'
+  - Concepts:
+      - 'concepts/gateway.md'
+      - 'concepts/sensor.md'
+      - 'concepts/event_source.md'
+      - 'concepts/trigger.md'
+      - 'concepts/parameterization.md'
+  - 'developer_guide.md'
   - 'controllers.md'
   - Releases ⧉: https://github.com/argoproj/argo-events/releases
   - Roadmap ⧉: https://github.com/argoproj/argo-events/milestones