feat: Upgrade editor (#1227)

* WIP

* document migration

* fix: Handle clashing keyboard events

* fix: convert getSummary

* fix: parseDocumentIds

* lint

* fix: Remove unused plugin

* Move editor version to header
Add editor version check for API endpoints

* fix: Editor update auto-reload
Bump RME

* test

* bump rme

* Remove slate flow types, improve themeing, bump rme

* bump rme

* fix: parseDocumentIds returning duplicate ID's, improved regression tests

* test

* fix: Missing code styles

* lint

* chore: Upgrade v2 migration to use AST

* Bump RME

* Update welcome doc

* add highlight to keyboard shortcuts ref

* theming improvements

* fix: Code comments show as headings, closes #1255

* loop

* fix: TOC highlighting

* lint

* add: Automated backup of docs before migration

* Update embeds to new format

* fix: React warning

* bump to final editor version 10.0.0

* test

server/migrations/20200519032353-text-backup.js

@@ -0,0 +1,19 @@
+'use strict';
+
+module.exports = {
+  up: async (queryInterface, Sequelize) => {
+    await queryInterface.addColumn('documents', 'backup', {
+      type: Sequelize.TEXT,
+      allowNull: true,
+    });
+    await queryInterface.addColumn('revisions', 'backup', {
+      type: Sequelize.SMALLINT,
+      allowNull: true,
+    });
+  },
+
+  down: async (queryInterface, Sequelize) => {
+    await queryInterface.removeColumn('documents', 'backup');
+    await queryInterface.removeColumn('revisions', 'backup');
+  }
+};