merge modifications

fix light theme

scss: block unused for comments

sass: fix sidebar top

update lunr

un-jquery-ify remaining js

un-jquery-ify greedynav

remove js sticky class control

when not as a sidebar, the css (top:) with sticky is invalid for static
position anyway

css-based follow button

sass: remove scrollbar webkit-ism

ruby-based anchor

js: trim currently unused feature

use css smooth scroll

move to webpack

update uglifyjs

purge jquery.ba-throttle-debounce, seems unused

fix masthead background

enable the light side

Really stick the head

sticky head