Add empty content directory to Git

- Added content/.gitkeep to track empty content directory
- Updated .gitignore to allow .gitkeep but ignore other content files
- Ensures content/ directory is visible on Git server
- Maintains security by ignoring actual content files

.gitignore

@@ -23,3 +23,4 @@ Thumbs.db
 
 # No content
 content/
+!content/.gitkeep