Currently, preview app is built on top of page-editor / page-editor subapp. Code base was mostly done in PoC/hackish mode and is not production-ready (e.g. lots of classes, subapp, presenters overridden to dismiss action bar, or compute/pass parameters to page-editor).
We should revise such integration by maybe using a Vaadin BrowserFrame component.
Beware of the following issues:
- We have to follow links in embedded site.
- We have to keep p13n preview parameters throughout navigation.