test: random visual themes for placeholder images
Redesign and refactor

- Remove rounded corners
- Larger padding overall
- Add shadows
- Add transitions
- Color tweaks to make buttons look more actionable
- Common visual language for nav/pager/pagination elements: light gray bg
- New variables for styling navs and pager
- pager-arrow fixes
- Override some of Bootstrap's hardcoded values with variables
  (e.g. padding)
dist/fonts: remove Font Awesome
Dist
v0.3.0