Extracted generation framework into StaticXSLT module
* i.e. the `detail` transformations were moved into a BuildXSLT module
* modified XML Makefile accordingly
* removed framework documentation from `README.md` and added usage documentation
* this was done to make it easier to use the basic static site generation framework in other projects
** the detail transformations were developed to enable the implementation of this blog but are generic enough to be used in other contexts