CSS Refactoring part 2

@texasag @prabinv
### CSS Refactoring part dos
Note: Not sure why index.html has a change - might need to "git" my act together

*Delete unused stylesheets
*Footer restructure
*Swap font families for weights to avoid faux bold
*Adjusted font smoothing for light on dark elements only
*Adjust spacing on mobile menu footer items
*Delete unused classes
*Alphabetize CSS elements
*Cleaning up BEM when possible
*Add M modifiers to reviews.scss
*Use Bootstrap classes for visibility
*Put Volusion classes last in HTML