Updating Sass

[pixelastic]

I want to report a bug:

Ruby Sass is going to be deprecated

What is the current behavior?

Running bundle install displays this warning:

Ruby Sass is deprecated and will be unmaintained as of 26 March 2019.

* If you use Sass as a command-line tool, we recommend using Dart Sass, the new
  primary implementation: https://sass-lang.com/install

* If you use Sass as a plug-in for a Ruby web framework, we recommend using the
  sassc gem: https://github.com/sass/sassc-ruby#readme

* For more details, please refer to the Sass blog:
  http://sass.logdown.com/posts/7081811

What is your expected behavior?

Update to sassc

[pixelastic]

Turns out there is nothing I could really do from the jekyll-algolia POV. The issue is coming from jekyll itself. This PR should fix it, I'll wait until it is merged.