rework jekyll include/exclude

rm gitattribute used by github

replace README for blog

fix copyright year

add license info

remove follow word in footer

unset .highlight .gh bg on light

fix pager color

grid: overflow: hidden

fix footer color

fix footer

light: tweak footer

light theme color tweaks

tweak light footer color

fix light highlight color

fix code background

leave syntax css to rougify

tweak selection

apply color scheme to highlight

merge modifications