with-socket.io example was using a single index file and was managing connection in there. This would lead handling connection (disconnecting and reconnecting) in each added page.
I updated example with addition of `_app.js` and handled connection in there. This helped only subscribing to event in page and maintaining connection throughout example.
* Add socket.io example
* [update] stop handling events before unmount
* [update] add deploy to now button
* Fix linting problems
* Fix last missing linting problem
