Reduce menu/banner contrast

- Introduce .strip layout module: two elements, side-by-side, one is a
button (.toggle) that takes up the entire height of the module
- change bg color of banner/menu to reduce overall contrast relative to
main content area (going with gold for now)
- make menu .item colors scoped appropriately for the primary/secondary
menus
- change up the somewhat awful appearance of nested sub-items in the
secondary menu. what was I thinking there?
- add some depth to the banner/menu. My thinking here is that the
banner should be spatially “above” the main content

related to issue #24
Massive layout changes to support large elements

Mostly removing the .card.primary content wrapper, and seeing what
happens

- Add StickyTableHeaders plugin to keep large tables under control
- Breadcrumbs simplified into a dedicated strip
- The main menu now slides ON TOP OF the content, instead of shoving it
over or down. This is easier to animate and involves shoving around
much fewer pixels, improving performance
- Cards are no longer as extensively used, so much of the layout had to
move out of _card and into the general scaffolding area
- Banner and main navigation areas are shifting from white to gold to
decrease their contrast relative to the main content
- Move much of the coloring into _settings, using a lot of lighten()
and darken() to simplify setting colors up
- introduce %readable extendable class: it caps line length at a
somewhat reasonable size
- introduce .strip class for table-like layouts with a single button:
used on the banner and with the table of contents button
- pagination will now entirely use .sequence buttons instead of the
<<first <prev 1 2 3 next> last>> nonsense. Clean out that CSS and markup
- scope all the absolutely positioned navigation to .enhanced
- clear out a bunch of settings
- change a few icon colors to match new theming
- resolve an event conflict between manilla tabs and whirligig carousel
controls

Related to issue #24
Bare min to make the footer less horrible

Background color and matching z-index

Related to issue #24
Merge branch 'remove-primary-card-layout' into gh-pages
Velocity changed from Sequences to Redirects

Fix some script to reflect that.

Related to issue #24
Build with de-Carding, blog post explanation

Related to issue #24