Update design

#### WIP

This implements most of the design found in #138. New UI elements haven't been added though.

Todo:

- [x] Update button design
  - [x] Hover state
  - [x] Active state
  - [x] Disabled state
  - [x] Large btn
  - [x] Run btn
  - [x] Danger btn
- [x] About page
- [x] Contact page
- [x] Settings page
- [x] Profile page