WIP - Foundationizing

Closes #5.

The intention is to improve the visual things and make changes easier, and get an advantage to learn foundation. :laughing:

But, I want to keep the actual looking of it, then the css must be kept, or at least the important parts of it.

So, here's the list of things to do:

- [x] Use foundation files
- [x] Remove the old fonts and normalizes from the old css
- [x] Remove the positioning things from the old css
- [x] Remove the font things from the old css
- [x] Change the GitHub button by an image
- [x] Adjust the positioning of elements using the foundation grid

More things to do can be found on the way...