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/stack.rb

@@ -0,0 +1,37 @@
+=begin
+File: stack.rb
+Created Time: 2024-04-06
+Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
+=end
+
+### Driver Code ###
+if __FILE__ == $0
+  # 初始化堆疊
+  # Ruby 沒有內建的堆疊類別，可以把 Array 當作堆疊來使用
+  stack = []
+
+  # 元素入堆疊
+  stack << 1
+  stack << 3
+  stack << 2
+  stack << 5
+  stack << 4
+  puts "堆疊 stack = #{stack}"
+
+  # 訪問堆疊頂元素
+  peek = stack.last
+  puts "堆疊頂元素 peek = #{peek}"
+
+  # 元素出堆疊
+  pop = stack.pop
+  puts "出堆疊元素 pop = #{pop}"
+  puts "出堆疊後 stack = #{stack}"
+
+  # 獲取堆疊的長度
+  size = stack.length
+  puts "堆疊的長度 size = #{size}"
+
+  # 判斷是否為空
+  is_empty = stack.empty?
+  puts "堆疊是否為空 = #{is_empty}"
+end