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

shared/embeds/components/Image.tsx

@@ -0,0 +1,14 @@
+import * as React from "react";
+import { cdnPath } from "../../utils/urls";
+
+type Props = {
+  alt: string;
+  src: string;
+  title?: string;
+  width?: number;
+  height?: number;
+};
+
+export default function Image({ src, alt, ...rest }: Props) {
+  return <img src={cdnPath(src)} alt={alt} {...rest} />;
+}