Update app.py

app.py

@@ -33,7 +33,7 @@ def generate_video():
             line = raw_lines[i].strip()
         
             # Check if it's a heading
-            if line.endswith('?') or line.endswith(';'):
+            if line.startswith('**') and (line.endswith('?**') or line.endswith(':**')):
                 heading = line
                 i += 1