Move mkdir_p into install_rdoc_static_file

This allows us to remove redundant code outside installing the static
file.
Embed SourceCodePro font

See:

http://store1.adobe.com/cfusion/store/html/index.cfm?store=OLS-US&event=displayFontPackage&code=1960

Embedded under the OFL 1.1.  See fonts.css for the license.