Sub-sticky-header foundation, outputting default sidebar subhead text, new colors and HTML generation script change

Front end
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Persistent sub-header, basic sidebar header styling with title.
Some reworked structural CSS
New color mixins per Jen
Sub-head should slide along with TOC drawer.

Back end
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Added some functionality to parse out the secondary title and pushed reg title info to the template.
Removed hard coded values from html generator and put them in settings.
New interface for running the static html generator:
python static_html_generator.py optional params:(1) reg version [default: remittances], (2) title part number [default: 1005], (3) EFT act [default: 15, 1693]