Refactor and add Style Components

[toinevk]

A long time user and fan of pup and its predecessor, I thought I should contribute! This PR refactors to move away from SCSS to styled components, a first step towards out of the box SSR. Addresses #81.

Key Notes:

• Create Custom Form Group to implement bootstrap overrides (f4a101f)
• Add Babel plugin for styled components required for SSR
• Remove SCSS files and packages
• Used InjectGlobal to attach styles to html and body in the footer component. This is not recommended by styled components authors, as part of the layout refactor I believe this can refactored (i.e. to a full page layout with 100% min height).
• All styles have been put into the component files.

Outstanding Questions

• Remove the files out of the folders given they are redundant?
• Refactored content component and pages to what I think the intended outcome should have been? The content component looked duplicated. Let me know if that should be undone (
  3a23638)

[cleverbeagle]

Hey @toinevk thanks for your work on this. We'll likely do this in house, but if you're interested in being involved in that effort send me an email: [email protected].