feat(frontend): settings grouped switches

CHANGELOG.md

@@ -18,6 +18,9 @@ written while it was being built. See [RELEASING.md](RELEASING.md).
 
 ### Added
 
+- The Settings page shows when you have changed a switch without saving, as
+  Manage Teams does: a bar at the top lists what is unsaved, with Save and
+  Discard, and leaving the page asks first. Saving keeps you on the page.
 - Changing your registration answers is easier to find. On a hackathon's
   Participants page your own entry is now at the top, marked "You", and its
   button reads "View & edit". Your profile there has an "Edit answers" button
@@ -77,6 +80,13 @@ written while it was being built. See [RELEASING.md](RELEASING.md).
 - For organizers, the "Participant View" section of a hackathon's sidebar is now
   folded every time you open the hackathon. Open it with its arrow when you need
   it.
+- A hackathon's Settings page now walks organizers through the event step by
+  step: registration, projects, preferences, teams, hacking, voting and results.
+  Each switch sits at the step where it is turned on, with links to the pages in
+  between, such as approving participants, forming teams and setting up voting.
+  A private hackathon links to its invitation links.
+- "Set team preferences" is now called "Choose preferred projects", since
+  participants pick projects, not teammates.
 - Manage Teams no longer has a "Suggest teams" button. Build teams by dragging
   people onto them, or by downloading the spreadsheet, filling in the team
   column and uploading it again.