Update navigation structure in mkdocs.yml to improve organization and accessibility

Author: MariusStorhaug

mkdocs.yml

@@ -57,9 +57,19 @@ nav:
   - Home: README.md
   - Projects:
       - PowerShell Modules: PowerShell/index.md
+          - PowerShell/Test-Specification.md
+          - PowerShell/Versioning.md
       - GitHub Actions: GitHub-Actions/index.md
+          - GitHub-Actions/Some-More.md
+          - GitHub-Actions/Test-Something.md
+          - GitHub-Actions/Subtopic/index.md
+          - GitHub-Actions/Subtopic/Some-More.md
+          - GitHub-Actions/Subtopic/Test-Something.md
+  - Solutions:
+      - Solutions/index.md
   - Blog:
-      - blog/index.md
+      - Blog/index.md
+  - About: About/index.md
 
 repo_name: PSModule/docs
 repo_url: https://github.com/PSModule/docs