* docs: add references to app.whenReady() in isReady
* refactor: prefer app.whenReady()
In the docs, specs, and lib, replace instances of `app.once('ready')`
(seen occasionally) and `app.on('ready')` (extremely common) with
`app.whenReady()`.
It's better to encourage users to use whenReady():
1. it handles the edge case of registering for 'ready' after it's fired
2. it avoids the minor wart of leaving an active listener alive for
an event that wll never fire again
* add: New fiddle for Manage Windows section example
* Delete package.json
Not needed
* Address issue with .gitignore file, load new window, removing unwanted css class
* Delete package.json
* Pushing change regarding the use of shell.OpenExternal API with an event listener for the href tag on the link
