Remove of old styling

[huv1k]

This PR removed all old styling the only source of truth is styled-components right now. Closes #200

Size of package before removing old styling:

File sizes after gzip:

  658.87 KB  build/static/js/index.js
  642.04 KB  build/static/js/middleware.js
  352 B      build/static/css/middleware.css
  348 B      build/static/css/index.css

After removing old styles:

File sizes after gzip:

  582.74 KB  build/static/js/index.js
  569.56 KB  build/static/js/middleware.js
  352 B      build/static/css/middleware.css
  348 B      build/static/css/index.css

[morajabi]

@HuVik Thanks a lot for finishing my half-written effort 🙈😅Sorry about leaving it like that. You're awesome :D