stele v2.0.2 - Code structure refactor

Refactor to separate the Electron main and renderer processes.

#66 - Move common config in webpack to base.js file

#64 - Refactor the app to organize the renderer (React app) in its own folder separate from the main
#65 - Clean up CSS handling in Webpack
#54 - Add a security warning
#56 - As a user I want a setting that will allow me to make Stele automatically start on boot so that I don't need to configure startup options manually user story
#58 - Ensure app has keyboard focus 5