[WEB-1682] refactor: editor code splitting (#4893)

* refactor: lite and rich text editors

* refactor: document editor migration

* fix: add missing css import

* refactor: issue embed widget splitting

* chore: remove extensions folder from ee

* chore: update web ee folder structure

* fix: build errors

---------

Co-authored-by: Satish Gandham <satish.iitg@gmail.com>

packages/editor/postcss.config.js

@@ -0,0 +1,9 @@
+// If you want to use other PostCSS plugins, see the following:
+// https://tailwindcss.com/docs/using-with-preprocessors
+
+module.exports = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+};