I have added the remaining discussions for chapter 1.

I have started adding discussions for chapter 2.
I did not include them in the main wiki page as that page is getting a bit unwieldy to edit.

Also I put in a link to a page the links to the discussions on the puzzles.
I did not see a need to add new discussions for the puzzles as the place where the puzzles are created seems like a reasonable discussion already.

You may notice that I have taken slight liberties with the exercise descriptions, including referenced objects so that you should not need to look them up in the book.