Add a consistent header and enable dark mode so that users have a consistent transition across when sites. code.djangoproject.com has got this header and no mode controls <img width="1394" height="564" alt="Image" src="https://github.com/user-attachments/assets/4e13ef81-a6f1-4a43-a6e4-3a7d3c57c7f8" /> while other sections have mode controls <img width="1397" height="503" alt="Image" src="https://github.com/user-attachments/assets/16d3d27d-6f1f-47f5-a5cc-841399327e74" />
Add a consistent header and enable dark mode so that users have a consistent transition across when sites.
code.djangoproject.com has got this header and no mode controls
while other sections have mode controls