fix: Allow the mode setup/creation to be async, and provide a few more values to extension/app config/mode setup. (#4016)

platform/docs/package.json

@@ -28,7 +28,7 @@
     "write-translations": "docusaurus write-translations",
     "write-heading-ids": "docusaurus write-heading-ids"
   },
-  "dependencies": {
+  "optionalDependencies": {
     "@docusaurus/core": "2.4.3",
     "@docusaurus/plugin-client-redirects": "2.4.3",
     "@docusaurus/plugin-google-gtag": "2.4.3",