Backport #23507 by @silverwind Add a bit more empty space on left and right side of page content for a more pleasant viewing experience. Also tweaked the mobile navbar to match. Before: <img width="1276" alt="Screenshot 2023-03-16 at 00 58 23" src="https://user-images.githubusercontent.com/115237/225473942-f544106f-1b61-456a-99fb-3ba136cabc8d.png"> After: <img width="1270" alt="Screenshot 2023-03-16 at 00 58 37" src="https://user-images.githubusercontent.com/115237/225473959-8b555359-a08d-48e1-9476-2710aabb1166.png"> Mobile Navbar: <img width="673" alt="Screenshot 2023-03-16 at 01 05 12" src="https://user-images.githubusercontent.com/115237/225473966-adccef2b-4d34-44ed-8c75-d4ca46d96cf3.png"> Co-authored-by: silverwind <me@silverwind.io>
