Several refinements:
 * Moved all generated script tags to the bottom of the body tag, in conformance to modern practices that delay loading of script libraries so that other page resources (e.g. images, CSS) can load before scripts, which may be larger
 * Expanded the sample site to demonstrate one way of integrating Bootstrap and jQuery into a site, by just adding them in tags used in the primary page tag
 * Expanded the sample site to demonstrate use of $ expressions and the special _body variable