Update all the docs with well-formed heads and current copyrights.

Hi Nick.

My editor does a lot of syntax checking (because I am incompetent). I cannot see my errors because the pages are ill-formed. I updated the head template to hush my syntax/linter. I also updated the copyright since I had to run build.py.

I hope you accept this because I work faster when I don't need to hunt for the bad tags.