Update Gemfile

Author: mdaneri

Gemfile

@@ -1,9 +1,15 @@
-source 'https://rubygems.org'
-
-gem "jekyll", "~> 4.4.1" # installed by `gem jekyll`
-# gem "webrick"        # required when using Ruby >= 3 and Jekyll <= 4.2.2
-
-gem "just-the-docs"# pinned to the current release
-# gem "just-the-docs"        # always download the latest release
-
-gem "jekyll-default-layout"
+source 'https://rubygems.org'
+
+gem "jekyll", "~> 4.4.1" # installed by `gem jekyll`
+# gem "webrick"        # required when using Ruby >= 3 and Jekyll <= 4.2.2
+
+gem "just-the-docs"# pinned to the current release
+# gem "just-the-docs"        # always download the latest release
+
+gem "jekyll-default-layout"
+
+gem "jekyll-seo-tag"
+
+gem "jekyll-sitemap"
+
+gem "jekyll-last-modified-at"