If you want general setting information, just click on Sigil Prep in the menu bar.
Want the course catalog for your favorite edition? Click on Curriculum Guides.
Need some NPCs? There’s a click for that.
The little town of Sigil East gets its own page (which I’ll fill up a bit at some point).
And of course, the Planescape Collegiate Athletic Association page has info on all the schools in all the various D&D settings. (Eventually, I plan for that to be literally true)
Enjoy increased ease of navigation, everyone!