chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

server/migrations/20210314173941-isViewer.js

@@ -1,15 +1,14 @@
-'use strict';
+"use strict";
 
 module.exports = {
   up: async (queryInterface, Sequelize) => {
-     await queryInterface.addColumn("users", "isViewer", {
+    await queryInterface.addColumn("users", "isViewer", {
       type: Sequelize.BOOLEAN,
       defaultValue: false,
       allowNull: false,
     });
   },
-
   down: async (queryInterface, Sequelize) => {
     await queryInterface.removeColumn("users", "isViewer");
-  }
+  },
 };