Started working on short-term solution for titles.
Removed unused code and updated requires.
Several things here:
* fixed (chapter ...)
* added (intro ...) for first slide
* added (chapter-title ...) and (intro-title ...)

These elements provide a means of structuring a slide deck with consistent
formatting for the headers of the deck as a whole, the chapter/section, and
then individual content slides.
Updated all the content slides with the following:
* set the the first slide to use (intro :title "..." ...)
* set chapter slides to use (chapter :title "..." ...)
* cleaned up long lines for notes, etc.
U#	modified:   src/cljs/example_deck/chapter1.cljs.hl
Merge pull request #1 from oubiwann/chapter-title

Added custom elements to better format slide decks