Began to implement responsive styles

- Made social links in footer have an underline on hover
- Added project images in directory for AHA
– Tweaked responsive styles in header to work across breakpoints
- Added shell page for contact

Refined project footer navigation

* Removed redundant arrows on the first and last project pages
* Added hover states to next and previous project titles plus "back to work"

Added project images into assets

Built out contact page and styles

Added if/else statement for tidy project footer navigation code