(#279) - use lowercase for all documentation files

Consistency makes linking between pages easier.

Author: ccarouge

…ocs/pages/infrastructure/Architecture.md …ocs/pages/infrastructure/architecture.mddocumentation/docs/pages/infrastructure/Architecture.md renamed to documentation/docs/pages/infrastructure/architecture.md documentation/docs/pages/infrastructure/Architecture.md renamed to documentation/docs/pages/infrastructure/architecture.md

@@ -35,10 +35,10 @@ nav:
 
   - Diagnostics:        pages/diagnostics/index.md
   - Infrastructure:    
-        - Architecture:          pages/infrastructure/Architecture.md
-        - Deployment:            pages/infrastructure/Deployment.md
-        - Building:              pages/infrastructure/Building.md
-        - Git practices:         pages/infrastructure/Git-practices.md
+        - Architecture:          pages/infrastructure/architecture.md
+        - Deployment:            pages/infrastructure/deployment.md
+        - Building:              pages/infrastructure/building.md
+        - Git practices:         pages/infrastructure/git-practices.md
 
 # Theme
 theme: