Refactor controls & splash component

[shannonmoranetz]

• [x] Move methods into App.js
• [x] Single responsibility principle for each method
• [x] Should be clear what is getting passed down to which components & why.

[pvinthemix]

• This PR should take care of some of the SRP clarity we were looking for in App

[shannonmoranetz]

Yes I'll go ahead and review now thanks!