Update mkdocs yaml file

mkdocs.yml

@@ -23,17 +23,18 @@ nav:
   - Introduction: "01_introduction.md"
   - Data Standards: "30_data_standards.md"
   - Data Licenses: "35_data_licenses.md"
-  - User Guide:
-    - Using DANDI: "10_using_dandi.md"
-    - Viewing Dandisets: "11_view.md"
-    - Downloading Data and Dandisets: "12_download.md"
-    - Creating Dandisets and Uploading Data: "13_upload.md"
-    - Validation Levels for NWB Files: "135_validation.md"
-    - Publishing Dandisets: "14_publish.md"
-    - Debugging: "15_debugging.md"
+  - User Guide: 
+    - "10_user_guide.md"
+    - Create DANDI Account: "16_account.md"
+    - View Dandisets: "11_view.md"
+    - Download Dandisets: "12_download.md"
+    - Create Dandisets: "13_upload.md"
+    - Validate NWB Files: "135_validate.md"
+    - Publish Dandisets: "14_publish.md"
+    - Debug: "15_debug.md"
     - DANDI CLI and Python API: https://dandi.readthedocs.io
   - Developer Guide:
-    - Project Structure: "20_project_structure.md"
+    - "20_developer_guide.md"
     - Notes: "40_development.md"
     - REST API Swagger: https://api.dandiarchive.org/swagger
     - REST API Redoc: https://api.dandiarchive.org/redoc
@@ -55,3 +56,24 @@ markdown_extensions:
 plugins:
   - search
   - open-in-new-tab
+  - section-index
+
+# Customize theme
+extra:
+  homepage: https://dandiarchive.org
+  generator: false # Disable watermark
+  social:
+    - icon: fontawesome/brands/slack
+      link: https://dandiarchive.slack.com
+      name: Slack
+    - icon: fontawesome/solid/paper-plane
+      link: mailto:info@dandiarchive.org
+    - icon: fontawesome/brands/x-twitter
+      link: https://twitter.com/dandiarchive
+      name: X-Twitter
+    - icon: fontawesome/brands/github
+      link: https://github.com/dandi
+      name: GitHub
+    - icon: fontawesome/brands/youtube
+      link: https://www.youtube.com/@dandiarchive
+      name: YouTube