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/deque.rb

@@ -0,0 +1,42 @@
+=begin
+File: deque.rb
+Created Time: 2024-04-06
+Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
+=end
+
+### Driver Code ###
+if __FILE__ == $0
+  # 初始化雙向佇列
+  # Ruby 沒有內直的雙端佇列，只能把 Array 當作雙端佇列來使用
+  deque = []
+
+  # 元素如隊
+  deque << 2
+  deque << 5
+  deque << 4
+  # 請注意，由於是陣列，Array#unshift 方法的時間複雜度為 O(n)
+  deque.unshift(3)
+  deque.unshift(1)
+  puts "雙向佇列 deque = #{deque}"
+
+  # 訪問元素
+  peek_first = deque.first
+  puts "佇列首元素 peek_first = #{peek_first}"
+  peek_last = deque.last
+  puts "佇列尾元素 peek_last = #{peek_last}"
+
+  # 元素出列
+  # 請注意，由於是陣列， Array#shift 方法的時間複雜度為 O(n)
+  pop_front = deque.shift
+  puts "佇列首出列元素 pop_front = #{pop_front}，佇列首出列後 deque = #{deque}"
+  pop_back = deque.pop
+  puts "佇列尾出列元素 pop_back = #{pop_back}, 佇列尾出列後 deque = #{deque}"
+
+  # 獲取雙向佇列的長度
+  size = deque.length
+  puts "雙向佇列長度 size = #{size}"
+
+  # 判斷雙向佇列是否為空
+  is_empty = size.zero?
+  puts "雙向佇列是否為空 = #{is_empty}"
+end