Update configuration.

mkdocs.yml

@@ -7,15 +7,13 @@ markdown_extensions:
 pages:
   - Home: index.md
   - Getting started:
-    - Concept overview: getting-started/the-software.md
+    - Concept: getting-started/the-software.md
     - System requirements: getting-started/system-requirements.md
     - 5 minutes setup: getting-started/docksal.md
     - Automate on your ci: getting-started/ci.md
   - Configuration:
     - Overview: configuration/overview.md
-    - Build configuration:
-      - Overview: configuration/build.md
-      - Hook configurations:
-        - Drupal: configuration/example-drupal-hooks.md
+    - Build configuration: configuration/build.md
     - Fin configuration: configuration/fin.md
-    - Server configuration: configuration/fin.md
+    - Hook configurations:
+      - Drupal: configuration/example-drupal-hooks.md