Converted index.html from XHTML+RDFa 1.0 to XHTML5+RDFa 1.1.

See: http://www.w3.org/TR/rdfa-in-html/
Added an <h1> title element to index.html.
Simplified the CSS stylesheeting.
Removed custom CSS styling in favor of Bootstrap CSS.
Ensured that index.html gets uploaded.