1.0 definitive version

Minor changes regarding some errors in code. Added a picture on the presentation page.

One important change : one variable added at the doors choice to prepare the endgame :

- If possible, it's better to rewind to this point (after the door choice is enough) and refresh the page to get the variable

- If you can't don't worry, I've find a solution to add this variable at the very beginning beginning of chapter 2.

Except for grammar checks or eventual major changes in the game walkthrough, the web brower version is definitive.