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/SkipNavLink.tsx

@@ -0,0 +1,33 @@
+import * as React from "react";
+import styled from "styled-components";
+import { id } from "~/components/SkipNavContent";
+
+export default function SkipNavLink() {
+  return <Anchor href={`#${id}`}>Skip navigation</Anchor>;
+}
+
+const Anchor = styled.a`
+  border: 0;
+  clip: rect(0 0 0 0);
+  height: 1px;
+  width: 1px;
+  margin: -1px;
+  padding: 0;
+  overflow: hidden;
+  position: absolute;
+  z-index: 1;
+
+  &:focus {
+    padding: 1rem;
+    position: fixed;
+    top: 12px;
+    left: 12px;
+    background: ${(props) => props.theme.background};
+    color: ${(props) => props.theme.text};
+    outline-color: ${(props) => props.theme.primary};
+    z-index: ${(props) => props.theme.depths.popover};
+    width: auto;
+    height: auto;
+    clip: auto;
+  }
+`;