* Added sidebar
  * Added links to socials
  * Moved portrait from `header` to sidebar
* Changed backgrounds
  * Checkerboard pattern for the outer background
  * Tiled icon of Sunny for the inner background

* Attribution:
  * [Terence Eden's SuperTinyIcons GitHub repository](https://github.com/edent/SuperTinyIcons) (MIT)  - Social link icons, for sidebar buttons
