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/ButtonLink.tsx

@@ -0,0 +1,22 @@
+import * as React from "react";
+import styled from "styled-components";
+
+type Props = {
+  onClick: React.MouseEventHandler<HTMLButtonElement>;
+  children: React.ReactNode;
+};
+
+export default function ButtonLink(props: Props) {
+  return <Button {...props} />;
+}
+
+const Button = styled.button`
+  margin: 0;
+  padding: 0;
+  border: 0;
+  color: ${(props) => props.theme.link};
+  line-height: inherit;
+  background: none;
+  text-decoration: none;
+  cursor: pointer;
+`;