Algolia search update (#2572)

* Search on menu toggle

With that change search is performed when requested. Before it was done
for each pageview, regardless of the fact if search was used by user or
not.

* Localize algolia's empty template

Update CHANGELOG and history

Updating link to wtfpl license (#2571)

The current wtpl license in the README is dead, so I'm updating it to use the current. The site doesn't have https, so if you want https we could also use https://choosealicense.com/licenses/wtfpl/.

Update CHANGELOG and history

Update CHANGELOG and history

Do not include in toc (#2558)

Load Font Awesome CSS from jsDelivr CDN (#2583)

* Load Font Awesome CSS from jsDelivr CDN
* Update CHANGELOG and history

Update CHANGELOG and history

Release 4.19.3 💎

Update CHANGELOG and history

Update GreedyNav.js

Replace custom comment hardcoded HTML with include

Also add custom_scripts.html include for custom comment provider JavaScript that loads in the footer.

Close #2549

Update CHANGELOG and history

Move page date to own file (#2544)

Update CHANGELOG and history

Strip trailing whitespace in seo_description (#2542)

Reword commit change

Make sticky sidebar live well with short content (#2514)

Fix typo

Release 4.19.2 💎