Swapping Highlight JS library

The new 8.0 branch of highlight.js doesn’t work well with the markdown
parser we’re using
Swapping Highlight Theme

Swapping for one compatible with the older version of highlight.js
Bug Fix

Moved highlight init to bottom of document to account for having moved
the dependant library there in commit
e95e45ed96d186626b5c97ff9c13fb650936e0ef
Updating Slide content

Reflects new capabilities and provides examples.
Merge branch 'markdown-highlighting'