Add progressive demo system with repository reorganization

Implements comprehensive demo system showing AI capabilities unlocked by each module export:
- 8 progressive demos from tensor math to language generation
- Complete tito demo CLI integration with capability matrix
- Real AI demonstrations including XOR solving, computer vision, attention mechanisms
- Educational explanations connecting implementations to production ML systems

Repository reorganization:
- demos/ directory with all demo files and comprehensive README
- docs/ organized by category (development, nbgrader, user guides)
- scripts/ for utility and testing scripts
- Clean root directory with only essential files

Students can now run 'tito demo' after each module export to see their framework's
growing intelligence through hands-on demonstrations.

scripts/fix_mlops_syntax.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+"""Fix syntax errors in mlops_dev.py"""
+
+import re
+
+# Read the file
+with open('modules/source/15_mlops/mlops_dev.py', 'r') as f:
+    content = f.read()
+
+# Fix the malformed function definitions
+# Pattern: def if __name__ == "__main__":\n    function_name():
+pattern = r'def if __name__ == "__main__":\n    (\w+)\(\):'
+replacement = r'def \1():'
+
+content = re.sub(pattern, replacement, content)
+
+# Write back
+with open('modules/source/15_mlops/mlops_dev.py', 'w') as f:
+    f.write(content)
+
+print("✅ Fixed syntax errors in mlops_dev.py")