Clean up hero sections.
Build Skills as Cogs
remove images not being used in section 3
remove less file not being used.
update comments in section 3 files being used.
update styles for section 3.
Separate button formatting from color.

Make btn-base and btn-complement1 as classes.  Added classes to sections throughout.  Allows us to change button formatting without affecting the colors, which are set in variables.less.