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/components/Editor/Embed.js

@@ -0,0 +1,52 @@
+// @flow
+import * as React from 'react';
+import styled from 'styled-components';
+import { fadeIn } from 'shared/styles/animations';
+import embeds from '../../embeds';
+
+export default class Embed extends React.Component<*> {
+  get url(): string {
+    return this.props.node.data.get('href');
+  }
+
+  get matches(): ?{ component: *, matches: string[] } {
+    const keys = Object.keys(embeds);
+
+    for (const key of keys) {
+      const component = embeds[key];
+
+      for (const host of component.ENABLED) {
+        const matches = this.url.match(host);
+        if (matches) return { component, matches };
+      }
+    }
+  }
+
+  render() {
+    const result = this.matches;
+    if (!result) return null;
+
+    const { attributes, isSelected } = this.props;
+    const { component, matches } = result;
+    const EmbedComponent = component;
+
+    return (
+      <Container
+        contentEditable={false}
+        isSelected={isSelected}
+        {...attributes}
+      >
+        <EmbedComponent matches={matches} url={this.url} />
+      </Container>
+    );
+  }
+}
+
+const Container = styled.div`
+  animation: ${fadeIn} 500ms ease-in-out;
+  line-height: 0;
+
+  border-radius: 3px;
+  box-shadow: ${props =>
+    props.isSelected ? `0 0 0 2px ${props.theme.selected}` : 'none'};
+`;