PSF core grant, days 25 & 26: unexpected skips & python.org/dev/ no more

The theme for the past two days has been about removing things. Yesterday was about issue 10966 and finishing the patch to remove the concept of (un)expected skipped tests. Today was about gutting http://www.python.org/dev/ to properly represent the fact that almost all of its content has been subsumed by http://docs.python.org/devguide/. Once the website rebuilds proper redirects will be in place to redirect from the old content to the devguide.