Upgraded to fontawesome v6

Gemfile

@@ -23,6 +23,7 @@ group :jekyll_plugins do
   gem "jekyll-contentblocks"
   gem "jekyll-assets"
   gem 'jekyll-font-awesome-sass'
+  gem "font-awesome-sass", "~>6.2"
   gem "sprockets", "~> 3.7"
   gem "kramdown-parser-gfm"
   gem 'remark'

Gemfile.lock

@@ -28,9 +28,9 @@ GEM
     extras (0.3.0)
       forwardable-extended (~> 2.5)
     fastimage (2.2.3)
-    ffi (1.15.0)
-    font-awesome-sass (5.15.1)
-      sassc (>= 1.11)
+    ffi (1.15.5)
+    font-awesome-sass (6.2.1)
+      sassc (~> 2.0)
     forwardable-extended (2.6.0)
     hpricot (0.8.6)
     html-proofer (3.18.8)
@@ -148,7 +148,7 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sassc (2.4.0)
+    sassc (2.1.0)
       ffi (~> 1.9)
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
@@ -175,6 +175,7 @@ PLATFORMS
 
 DEPENDENCIES
   execjs
+  font-awesome-sass (~> 6.2)
   html-proofer (~> 3.0)
   jekyll (< 4.0)
   jekyll-assets
@@ -189,6 +190,7 @@ DEPENDENCIES
   kramdown-parser-gfm
   remark
   rubocop (~> 0.50)
+  sassc (~> 2.1.0)
   sprockets (~> 3.7)
   therubyracer
   tzinfo-data

assets/css/site.scss

@@ -4,7 +4,7 @@
 @charset "utf-8";
 
 $fa-font-path: "../fonts/font-awesome/";
-@import 'https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css';
+@import 'fontawesome.all.min.css';
 @import "{{site.theme}}";
 
 $font-size-base: 1rem;