update Cloud Portal documentation

This is a first version of the updated cloud portal documentation to replace the old technical platform docs. I will continue to update this in subsequent MRs.

mkdocs.yml

@@ -141,8 +141,8 @@ nav:
           - Security Considerations:
                   - AAI Integration: 'cloud-services/security/aai-integration.md'
           - Cloud Portal:
-                  - Architecture: 'cloud_portal/CP_Architecture.md'
-                  - Developer Manual: 'cloud_portal/CP_DeveloperManual.md'
+                  - Architecture: 'cloud-portal/CP_Architecture.md'
+                  - Developer Manual: 'cloud-portal/CP_DeveloperManual.md'
     - Software Services:
         - Overview: 'software/index.md'
         - Two-Factor Authentication: 'software/concepts/2fa/index.md'