Rewrote site header as a Bootstrap Navbar
Rewrote site footer
Fixed grid problems and other styling

- Added rows as necessary
- Added columns as necessary
- Added borders to all tables
- Retagged, reclassified and restyled various elements (especially
headings)
- Added h4 placeholder in the “further reading” section. @shakhal -
please add dynamic content.
- Tried to transform breadcrumbs into Bootstrap breadcrumbs component,
but proved to be too difficult with the dynamic content. @shakhal  -
please take care of this as well.