Add Ruby code blocks to the documents (#1200)

* Add Ruby code blocks to documents

* Remove Ruby code from en/docs

docs/chapter_hashing/hash_algorithm.md

@@ -371,6 +371,12 @@ $$
     // 节点对象 utils.ListNode@1d81eb93 的哈希值为 495053715
     ```
 
+=== "Ruby"
+
+    ```ruby title="built_in_hash.rb"
+
+    ```
+
 === "Zig"
 
     ```zig title="built_in_hash.zig"

docs/chapter_hashing/hash_map.md

@@ -290,6 +290,12 @@
     map.remove(10583)
     ```
 
+=== "Ruby"
+
+    ```ruby title="hash_map.rb"
+
+    ```
+
 === "Zig"
 
     ```zig title="hash_map.zig"
@@ -503,6 +509,12 @@
     }
     ```
 
+=== "Ruby"
+
+    ```ruby title="hash_map.rb"
+
+    ```
+
 === "Zig"
 
     ```zig title="hash_map.zig"