added header nav

Author: nocomplexity

myst.yml

@@ -27,4 +27,18 @@ site:
     logo: images/nocxbanner.png
     folders: true  
     style: _static/nocxstyle2026.css
-
+  nav:
+      - title: Fundamentals
+        url: /fundamentals/fundamentals-intro
+      - title: How-to
+        url: /recipes/recipes-intro 
+      - title: Tools
+        url: /securitytools/tools-intro
+      - title: Key Definitions
+        url: /appendices/definitions       
+      - title: Courses
+        children:
+        - title: Security Testing for Python
+          url: https://securitytesting.nocomplexity.com/
+        - title: Security By Design
+          url: https://nocomplexity.github.io/securitybydesign/