perf: Reduce initial bundle size / async bundle loading (#1456)

* feat: Move to React.lazy

* perf: Remove duplicate babel/runtime

* fix: Run yarn-deduplicate

* Further attempts to remove rich-markdown-editor from initial chunk

* perf: Lazy loading of authenticated routes

* perf: Move color picker to async loading
fix: Display placeholder when loading rich editor

* fix: Cache bust on auto reload

app/utils/ApiClient.js

@@ -1,7 +1,6 @@
 // @flow
 import invariant from "invariant";
 import { map, trim } from "lodash";
-import pkg from "rich-markdown-editor/package.json";
 import stores from "stores";
 import download from "./download";
 import {
@@ -57,7 +56,7 @@ class ApiClient {
       Accept: "application/json",
       "Content-Type": "application/json",
       "cache-control": "no-cache",
-      "x-editor-version": pkg.version,
+      "x-editor-version": EDITOR_VERSION,
       pragma: "no-cache",
     });
     if (stores.auth.authenticated) {