feat: Additional embed integrations (#3398)

* feat: Gliffy integration

* feat: JSFiddle integration

* feat: Otter.ai integration

* Optimised images with calibre/image-actions

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

shared/editor/embeds/Otter.tsx

@@ -0,0 +1,19 @@
+import * as React from "react";
+import Frame from "../components/Frame";
+import { EmbedProps as Props } from ".";
+
+function Otter(props: Props) {
+  return (
+    <Frame
+      {...props}
+      src={props.attrs.href}
+      title="Otter.ai Embed"
+      referrerPolicy="origin"
+      border
+    />
+  );
+}
+
+Otter.ENABLED = [new RegExp("https?://otter.ai/[su]/(.*)$")];
+
+export default Otter;