strip out unneeded groups

color tweaks and new supported vim plugins

update image again

update screenshot

brighten up red

brighten comment color

Been programming out at the beach a lot more recently and felt like the
comment color didn't have enough contrast when I was in the sun. I've
made it slightly brighter and I think it looks better now.

add license

add readme

change base16 to have a black background

add default base16 dark