US24 // Styling overhaul

[matschi3]

• use custom font (if possible a flexible/variable one)
• setup correct font sizes on buttons, links, texts
• choose 2-3 main colors with matching additional highlighting color (in addition to custom black/white)
• find the correct place for new colors
• define min/max sizes for Cards
• style cards alá retro with black box-shadow (and gradient coloring)
• add a main background to all pages (maybe animation if there is a matching one)
• create mockups + clickthrue-.gif for Readme-file and update (Graduation Event)