chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

app/hooks/useStores.ts

@@ -0,0 +1,7 @@
+import { MobXProviderContext } from "mobx-react";
+import * as React from "react";
+import RootStore from "~/stores";
+
+export default function useStores() {
+  return React.useContext(MobXProviderContext) as typeof RootStore;
+}