adding getting started page based on Bootstrap University from awhile back, testing out side nav on docs instead of subnav bar

1. Rename file from responsive-utility-classes.less to responsive-utilities.less
2. Add additional help text around the documentation for the classes in Scaffolding
3. Remove unnecessary display values on initial classes
4. Drop block values for inherit for better support on inline and table elements
5. Make use of \!important on every class to avoid classes with more specific selectors (e.g., .span* classes for the grid)

Added the doc typo fixes to the .mustache files as well.

add new global styles docs section for mentioning doctype requirements, base body changes, and type/links; also tightened up code styles