jekyll-favicon: Add to full Jekyll setup

pkgs/applications/misc/jekyll/basic/Gemfile.lock

···
   jemoji
 
 BUNDLED WITH
-   2.3.25
+   2.3.9

pkgs/applications/misc/jekyll/full/Gemfile

···
 # Optional dependencies:
 gem "jekyll-coffeescript"
 #gem "jekyll-docs"
+gem "jekyll-favicon"
 gem "jekyll-feed", "~> 0.9"
 gem "jekyll-gist"
 gem "jekyll-paginate"

pkgs/applications/misc/jekyll/full/Gemfile.lock

···
     jekyll-coffeescript (2.0.0)
       coffee-script (~> 2.2)
       coffee-script-source (~> 1.12)
+    jekyll-favicon (1.1.0)
+      jekyll (>= 3.0, < 5.0)
+      mini_magick (~> 4.11)
+      rexml (~> 3.2, >= 3.2.5)
     jekyll-feed (0.17.0)
       jekyll (>= 3.7, < 5.0)
     jekyll-gist (1.5.0)
···
     mime-types (3.4.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2022.0105)
+    mini_magick (4.11.0)
     mini_portile2 (2.8.0)
     minitest (5.16.3)
     nokogiri (1.13.9)
···
   jekyll
   jekyll-avatar
   jekyll-coffeescript
+  jekyll-favicon
   jekyll-feed (~> 0.9)
   jekyll-gist
   jekyll-mentions
···
   yajl-ruby (~> 1.4)
 
 BUNDLED WITH
-   2.3.25
+   2.3.9

pkgs/applications/misc/jekyll/full/gemset.nix

···
     };
     version = "2.0.0";
   };
+  jekyll-favicon = {
+    dependencies = ["jekyll" "mini_magick" "rexml"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0dyksm4i11n0qshd7wh6dvk8d0fc70dd32ir2dxs6igxq0gd6hi1";
+      type = "gem";
+    };
+    version = "1.1.0";
+  };
   jekyll-feed = {
     dependencies = ["jekyll"];
     groups = ["default"];
···
       type = "gem";
     };
     version = "3.2022.0105";
+  };
+  mini_magick = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1aj604x11d9pksbljh0l38f70b558rhdgji1s9i763hiagvvx2hs";
+      type = "gem";
+    };
+    version = "4.11.0";
   };
   mini_portile2 = {
     groups = ["default"];