Add Rakefile for documentation site management with serve and install tasks

Signed-off-by: HAHWUL <[email protected]>

Author: hahwul

Rakefile

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+namespace :docs do
+  desc 'Serve the documentation site'
+  task :serve do
+    within_docs_directory do
+      unless system('bundle check')
+        puts "Bundler is not installed or dependencies are not met. Please run 'rake docs:install'."
+        exit 1
+      end
+
+      sh 'bundle exec jekyll s'
+    end
+  end
+
+  desc 'Install dependencies for the documentation site'
+  task :install do
+    within_docs_directory do
+      sh 'bundle install'
+    end
+  end
+
+  def within_docs_directory(&block)
+    Dir.chdir('docs', &block)
+  rescue Errno::ENOENT => e
+    puts "Directory 'docs' not found: #{e.message}"
+    exit 1
+  rescue StandardError => e
+    puts "An error occurred: #{e.message}"
+    exit 1
+  end
+end