2013-06-24-wise: Cleanup HTML markup

The exising WiSE pages have a number of markup issues, which I've
fixed in this PR.  For example, compare:

* http://wking.github.io/swc-boot-camps/2013-06-24-wise/test_install.html
* http://swcarpentry.github.io/boot-camps/2013-06-24-wise/test_install.html

The pages now pass the W3C validator (http://validator.w3.org/) with
the only error being the lack of a character encoding declaration.
Since that should be fixed at the layout level, I've left it
unchanged.

There is a lot of other boilerplate in here that should be dealt with
at the layout level, but this cleans the site up enough for tomorrow,
and we can work out a better system for moving forward at a more
relaxed pace ;).