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

server/migrations/20181215192422-document-embeds.js

@@ -0,0 +1,12 @@
+module.exports = {
+  up: async (queryInterface, Sequelize) => {
+    await queryInterface.addColumn('teams', 'documentEmbeds', {
+      type: Sequelize.BOOLEAN,
+      allowNull: false,
+      defaultValue: true
+    });
+  },
+  down: async (queryInterface, Sequelize) => {
+    await queryInterface.removeColumn('teams', 'documentEmbeds');
+  }
+}