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/components/NavLink.tsx

@@ -0,0 +1,28 @@
+import * as React from "react";
+import { NavLink, Route } from "react-router-dom";
+
+type Props = React.ComponentProps<typeof NavLink> & {
+  children?: (match: any) => React.ReactNode;
+  exact?: boolean;
+  activeStyle?: React.CSSProperties;
+  to: string;
+};
+
+function NavLinkWithChildrenFunc(
+  { to, exact = false, children, ...rest }: Props,
+  ref?: React.Ref<HTMLAnchorElement>
+) {
+  return (
+    <Route path={to} exact={exact}>
+      {({ match }) => (
+        <NavLink {...rest} to={to} exact={exact} ref={ref}>
+          {children ? children(match) : null}
+        </NavLink>
+      )}
+    </Route>
+  );
+}
+
+export default React.forwardRef<HTMLAnchorElement, Props>(
+  NavLinkWithChildrenFunc
+);