feat(about): add hotkeys list (#4165)

packages/definitions/src/hotkeys.ts

@@ -0,0 +1,6 @@
+export const hotkeys = {
+  toggleBoardEdit: "mod+e",
+  toggleColorScheme: "mod+j",
+  saveNotebook: "mod+s",
+  openSpotlight: "mod+k",
+};

packages/definitions/src/index.ts

@@ -13,3 +13,4 @@ export * from "./cookie";
 export * from "./search-engine";
 export * from "./onboarding";
 export * from "./emptysuperjson";
+export * from "./hotkeys";