update pygments highlighting with customizations from preboot

BS3 commit f77dc54
remove inner shadow from .highlight

BS3 commit be8f992
typo

BS3 commit e0de08c
Use form elements in checkbox and radio button groups

* Uses .btn on label elements with nested checkbox and radio controls
within
* Updated examples to reflect change in HTML and CSS
* Had to add .active all buttons for proper state highlighting
(mimicing the :active pseudo state)
* Still needs JavaScript plugin updated by @fat

BS3 commit efbf837
colorize links in alerts

BS3 commit fe2658e