snake game (mvc)

Getting Started
1. open a completed lesson 5 repl
2. if you have not completed lesson 5, do lesson 5!
3. open the lesson 6 index.html, script.js, and style.css on github.
4. where do the index.html files differ?
5. where do the script.js files differ?
6. where do the style.css files differ?
7. update the lesson 5 code to match the lesson 6 snake game code.
8. play the game, and test that the game works as expected.
9. fix any issues you find
10. host your complete game on github pages