Update UI to appear more fun / playful

[cedricium]

This will be a master issue tracking several elements for updating the overall UI to look more playful / fun / welcoming. The first step taken was giving the Site cards some box-shadow and making them look as if they're floating on :hover. Although this project is mainly focused on getting experience with Vue.js, I'd like to take the time to further develop my web development, and more precisely, web design skills.

Much of the inspiration for these design changes comes from this article: https://medium.com/refactoring-ui/7-practical-tips-for-cheating-at-design-40c736799886

• [x] Add box-shadow to Site cards and make them "float" on hover - a1d82c1
• [ ] Update fonts from default Vue fonts (i.e. Nunito or Poppins)
• [ ] Increase the size of Site card images in Sites.vue, display full-page site screenshot in ViewSite.vue (similar to https://www.lapa.ninja or https://land-book.com)

[cedricium]

Update icons to use emojis???

Note: this is seriously being considered hehe.