Point to the dircolors-solarized project, and simplify readme.
Point to the dircolors-solarized project, and simplify readme.

JianyuWang/gnome-terminal-colors-solarized,erikbrinkman/gnome-terminal-colors-solarized,jaehyuk/gnome-terminal-colors,esindril/gnome-terminal-colors-solarized,dlnguyen/solarized,lvfeng1130/gnome-terminal-colors-solarized,GregoryShen/gnome-terminal-colors-solarized,ifels/gnome-terminal-colors-solarized,yitang/gnome-terminal-colors-solarized