* Use absolute URL in faq.md image link
The relative link is rendered relative to the host domain, which works fine when viewing it on Github, but since you also use the same generated HTML in your doc site, the link is broken. See here: https://www.electronjs.org/docs/latest/faq#the-font-looks-blurry-what-is-this-and-what-can-i-do
Using an absolute URL here should fix the issue on the main site.
* Use inline image reference for subpixel rendering example
As suggested by @dsanders11
* 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
