Update to jekyll 4

Gemfile

@@ -1,10 +1,5 @@
 source 'https://rubygems.org'
 
-# gem 'jekyll', '~>4.4.1'
+gem 'jekyll', '~>4.4.1'
-gem 'jekyll', '4.2.2'
 gem 'jekyll-paginate'
 gem 'rexml'
-gem 'logger'
-gem 'csv'
-gem 'base64'
-gem 'bigdecimal'

Gemfile.lock

@@ -1,44 +1,53 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.8)
+    addressable (2.9.0)
       public_suffix (>= 2.0.2, < 8.0)
-    base64 (0.3.0)
+    base64 (0.2.0)
-    bigdecimal (4.0.1)
+    bigdecimal (3.1.8)
     colorator (1.1.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
-    csv (3.3.5)
+    csv (3.3.2)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
     eventmachine (1.2.7)
-    ffi (1.17.3-x86_64-linux-gnu)
+    ffi (1.17.4)
+    ffi (1.17.4-x86_64-linux-gnu)
     forwardable-extended (2.6.0)
+    google-protobuf (4.35.1-x86_64-linux-gnu)
+      bigdecimal
+      rake (~> 13.3)
     http_parser.rb (0.8.1)
-    i18n (1.14.8)
+    i18n (1.15.2)
       concurrent-ruby (~> 1.0)
-    jekyll (4.2.2)
+    jekyll (4.4.1)
       addressable (~> 2.4)
+      base64 (~> 0.2)
       colorator (~> 1.0)
+      csv (~> 3.0)
       em-websocket (~> 0.5)
       i18n (~> 1.0)
-      jekyll-sass-converter (~> 2.0)
+      jekyll-sass-converter (>= 2.0, < 4.0)
       jekyll-watch (~> 2.0)
-      kramdown (~> 2.3)
+      json (~> 2.6)
+      kramdown (~> 2.3, >= 2.3.1)
       kramdown-parser-gfm (~> 1.0)
       liquid (~> 4.0)
-      mercenary (~> 0.4.0)
+      mercenary (~> 0.3, >= 0.3.6)
       pathutil (~> 0.9)
-      rouge (~> 3.0)
+      rouge (>= 3.0, < 5.0)
       safe_yaml (~> 1.0)
-      terminal-table (~> 2.0)
+      terminal-table (>= 1.8, < 4.0)
+      webrick (~> 1.7)
     jekyll-paginate (1.1.0)
-    jekyll-sass-converter (2.2.0)
+    jekyll-sass-converter (3.1.0)
-      sassc (> 2.0.1, < 3.0)
+      sass-embedded (~> 1.75)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    kramdown (2.5.1)
+    json (2.9.1)
-      rexml (>= 3.3.9)
+    kramdown (2.5.2)
+      rexml (>= 3.4.4)
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.4)
@@ -46,34 +55,33 @@ GEM
       logger
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    logger (1.7.0)
+    logger (1.6.4)
     mercenary (0.4.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (7.0.2)
+    public_suffix (7.0.5)
+    rake (13.4.2)
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.3.9)
+    rexml (3.4.4)
-    rouge (3.30.0)
+    rouge (4.7.0)
     safe_yaml (1.0.5)
-    sassc (2.4.0)
+    sass-embedded (1.101.0-x86_64-linux-gnu)
-      ffi (~> 1.9)
+      google-protobuf (~> 4.31)
-    terminal-table (2.0.0)
+    terminal-table (3.0.2)
-      unicode-display_width (~> 1.1, >= 1.1.1)
+      unicode-display_width (>= 1.1.1, < 3)
-    unicode-display_width (1.8.0)
+    unicode-display_width (2.6.0)
+    webrick (1.9.2)
 
 PLATFORMS
+  ruby
   x86_64-linux
 
 DEPENDENCIES
-  base64
+  jekyll (~> 4.4.1)
-  bigdecimal
-  csv
-  jekyll (= 4.2.2)
   jekyll-paginate
-  logger
   rexml
 
 BUNDLED WITH
-   2.3.5
+   2.6.9

_sass/_base.scss

@@ -120,7 +120,7 @@ a {
     color: $brand-color;
     text-decoration: none;
     &:visited {
-        color: darken($brand-color, 15%);
+        color: color.adjust($brand-color, $lightness: -15%, $space: hsl);
     }
     &:hover {
         color: $text-color;

css/main.scss

@@ -4,6 +4,7 @@
 
 @charset "utf-8";
 
+@use 'sass:color';
 
 // Our variables
 $base-font-family: 'Share Tech', sans-serif;
@@ -18,8 +19,8 @@ $background-color: #d2d4bc;
 $brand-color: #2a7ae2;
 
 $grey-color: #828282;
-$grey-color-light: lighten($grey-color, 40%);
+$grey-color-light: color.adjust($grey-color, $lightness: 40%, $space: hsl);
-$grey-color-dark: darken($grey-color, 25%);
+$grey-color-dark: color.adjust($grey-color, $lightness: -25%, $space: hsl);
 
 $on-palm: 600px;
 $on-laptop: 800px;