feat: Option for separate edit mode (#4203)

* stash

* wip

* cleanup

* Remove collaborativeEditing toggle, it will always be on in next release.
Flip separateEdit -> seamlessEdit

* Clarify language, hide toggle when collaborative editing is disabled

* Flip boolean to match, easier to reason about

server/services/web.ts

@@ -67,6 +67,10 @@ export default function init(app: Koa = new Koa()): Koa {
         poll: 1000,
         ignored: ["node_modules", "flow-typed", "server", "build", "__mocks__"],
       },
+      // Uncomment to test service worker
+      // headers: {
+      //   "Service-Worker-Allowed": "/",
+      // },
       // public path to bind the middleware to
       // use the same as in webpack
       publicPath: config.output.publicPath,