Editor embeds (#680)

- [x] Make deleting an embed easier
- [x] Add document level ability to disable embeds
- [x] Add team level ability to disable embeds
- [x] GitHub
- [x] Numeracy
- [x] Mode Analytics
- [x] Figma
- [x] Airtable
- [x] Vimeo
- [x] RealtimeBoard
- [x] Loom
- [x] Lucidcharts
- [x] Framer
- [x] InVision
- [x] Typeform
- [x] Marvel
- [x] Spotify
- [x] Codepen
- [x] Trello

app/embeds/Loom.js

@@ -0,0 +1,26 @@
+// @flow
+import * as React from 'react';
+import Frame from './components/Frame';
+
+const URL_REGEX = /^https:\/\/(www\.)?useloom.com\/(embed|share)\/(.*)$/;
+
+type Props = {
+  url: string,
+};
+
+export default class Loom extends React.Component<Props> {
+  static ENABLED = [URL_REGEX];
+
+  render() {
+    const normalizedUrl = this.props.url.replace('share', 'embed');
+
+    return (
+      <Frame
+        width="420px"
+        height="235px"
+        src={normalizedUrl}
+        title="Loom Embed"
+      />
+    );
+  }
+}