Default layout should use local/relative resources

[regulationsgov]

The default layout file is still referring to a fully qualified URI for the css and javascript resources. I'm not sure the best way to address this and still make it easy to use as both an organization and project page in github-pages.

[shawnjohnson]

This commit pretty much sums up the changes that might be needed.

https://github.com/GSA/sam_api/commit/b5c119f26e5a3cbac9126ff5d3c4a4c33bd7d796