Navigation update

Working on updating the navigation... So it actually works as intended.

Classes are set up, switching between them works somewhat, needs some
more work. Navigation changes starting on line 106 in script.js is the
event I'm working on now.
TODO:
- Make classes switch no matter if clicking on slides or dot navigation.

- Have the slides change position when selected.
- rewrite the slide function so it uses the new classes set up, and
changes dot navigation.
- Start work on responsive layout.