nuke line numbers
Fixes #7744: update grid mixin to use latest grid styles
no units on 0 values
no need for zero padding on navbar top/bottom; better comment
add back bottom margin to navbars
make that left/right padding, not top/bottom on navbar
outdent the rows for tablets and above
add the fade class to the default modal docs
Use @font-size-... variables instead of hardcoded font-size in px