* Create template for spec pages
* Adapt syntax-table styles to Bootstrap
* Reposition type/size annotations at col 86 (and update README.md)
* Let Bootstrap style breadcrumb trails
* Unrelated: abstract footer to an _include
Though homepage is rendered completely from a template,
it still needs an index.md to generate.
Also change subpage breadcrumb links to relative, so they
work in the GitHub Pages context. For example "/" points
to the Google Org's home rather than Draco's home, so use
"..", etc.
