lobotomized owls!

Swapped in some lobotomized owl selectors in .entry-content and
.widget-area. Also changed a few REMs to EMs so they will automatically
adjust if the root font size changes.
Added Get Started section to readme.md
Additional variables. Some margins and line heights based on variables.

Also deleted some redundent lines.
Replaced most margins and paddings with variable values.
Updated readme.md