Put the nav in the correct place.
Unpin the navbar from the top.
Contain the page-header properly and divide it logically.  Convert the
pagination buttons to a vertical nav-pill layout instead.  Add in the
toy names, as well as the tag lines for each viz.
Move the page-header for viz pages into its own template.
Add the ending </article> tag here, until I can figure out a
viz/footer.html template.
Include the new viz/header and viz/explanations templates into the
main gallery template.
Trim this down to just the visualization section, which includes the
legend and local viz-nav.  The javascript includes are a TODO:REMOVE.
Put the nav in the proper place and include the new viz/header and
viz/explanations templates in this layout.
Trim this down to only the visualization section.
Switch to using the stacked nav pills.  Clean up the headings, and make
sure that the links link to the visualization in the view screen.
Add metadata used in the templates and switch to markdown.
Override styles for the viz templates.