make menus more important

Author: kmurphypolygon

mkdocs.yml

@@ -53,8 +53,10 @@ nav:
   - CDK:
       - CDK: cdk/index.md
       - Overview: cdk/overview.md
-      - Version compatibility matrix: cdk/version-matrix.md
-      - Get started: cdk/getting-started/local-deployment.md
+      - Releases:
+        - Version compatibility matrix: cdk/version-matrix.md
+      - Get started: 
+        - Local deployment guide: cdk/getting-started/local-deployment.md
       - Concepts:
         - Layer 2s: cdk/concepts/layer2s.md
         - L2 architecture overview: cdk/concepts/architecture.md