Many bug fixes and improvements (#1270)

* Add Ruby and Kotlin icons
Add the avatar of @curtishd

* Update README

* Synchronize zh-hant and zh versions.

* Translate the pythontutor blocks to traditional Chinese

* Fix en/mkdocs.yml

* Update the landing page of the en version.

* Fix the Dockerfile

* Refine the en landingpage

* Fix en landing page

* Reset the README.md

zh-hant/codes/ruby/chapter_stack_and_queue/queue.rb

@@ -0,0 +1,38 @@
+=begin
+File: queue.rb
+Created Time: 2024-04-06
+Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
+=end
+
+### Driver Code ###
+if __FILE__ == $0
+  # 初始化佇列
+  # Ruby 內建的佇列（Thread::Queue) 沒有 peek 和走訪方法，可以把 Array 當作佇列來使用
+  queue = []
+
+  # 元素入列
+  queue.push(1)
+  queue.push(3)
+  queue.push(2)
+  queue.push(5)
+  queue.push(4)
+  puts "佇列 queue = #{queue}"
+
+  # 訪問佇列元素
+  peek = queue.first
+  puts "佇列首元素 peek = #{peek}"
+
+  # 元素出列
+  # 清注意，由於是陣列，Array#shift 方法時間複雜度為 O(n)
+  pop = queue.shift
+  puts "出列元素 pop = #{pop}"
+  puts "出列後 queue = #{queue}"
+
+  # 獲取佇列的長度
+  size = queue.length
+  puts "佇列長度 size = #{size}"
+
+  # 判斷佇列是否為空
+  is_empty = queue.empty?
+  puts "佇列是否為空 = #{is_empty}"
+end