feat: Add CDN support (#1817)

* chore: CSP

* chore: Optionally use CDN for serving images

app/components/Image.js

@@ -0,0 +1,12 @@
+// @flow
+import * as React from "react";
+import { cdnPath } from "utils/urls";
+
+type Props = {
+  alt: string,
+  src: string,
+};
+
+export default function Image({ src, alt, ...rest }: Props) {
+  return <img src={cdnPath(src)} alt={alt} {...rest} />;
+}