Structure the current Electron project

[victorrattis]

This issue should do the following points:

• Remove the server;
• Load a local app page (index.js) instead of mainWindow.loadURL('http://localhost:3000');
• Remove README.old.md file;
• Update package.json scripts to execute the electron app;
• Execute React lib in the project;
• Remove the public directory;

[victorrattis]

Reference for this issue: How to build an Electron app using create-react-app. No webpack configuration or “ejecting” necessary

I think we could implement the same thing which this post (a initial solution).