chore: Refactor authentication pass between subdomains (#1619)

* fix: Use get request instead of cookie to transfer token between domains

* Add domain to database
Add redirects to team domain when present

* 30s -> 1m

* fix: Avoid redirect loop if subdomain and domain set

* fix: Create a transfer specific token to prevent replay requests

* refactor: Move isCustomDomain out of shared as it won't work on the client

server/migrations/20201103050534-custom-domains.js

@@ -0,0 +1,15 @@
+'use strict';
+
+module.exports = {
+  up: async (queryInterface, Sequelize) => {
+    await queryInterface.addColumn('teams', 'domain', {
+      type: Sequelize.STRING,
+      allowNull: true,
+      unique: true
+    });
+  },
+
+  down: async (queryInterface, Sequelize) => {
+    await queryInterface.removeColumn('teams', 'domain');
+  }
+};