Catalog page generator: Fix website home URL

We aren't at "brooklyncentral" any more
Catalog page generator: change jquery source href

Switches from a non-secure location on jquery.org to a HTTPS location
provided by Google
Catalog page generator: change underscore.js href

Now uses a relative link to the underscore.js that is part of the
website, instead of the non-secure http:// link to an external site.
This closes #187

* github/pr/187:
  Catalog page generator: change underscore.js href
  Catalog page generator: change jquery source href
  Catalog page generator: Fix website home URL