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

ruby-based anchor

js: trim currently unused feature

use css smooth scroll

move to webpack

update uglifyjs

purge jquery.ba-throttle-debounce, seems unused

Release 4.20.2 💎

Change "fa" to "fas" for Font Awesome 5 (#2649)

* main.js: fa -> fas for FA 5

* Update CHANGELOG and history

Release 4.20.1 💎

Release 4.20.0 💎

Use layout: none instead of null (#2617)

* Use layout: none instead of null

* Update CHANGELOG and history

Release 4.19.3 💎

Update GreedyNav.js

Release 4.19.2 💎

Release 4.19.1 💎