docs: add Japanese translate documents (#1812)

* docs: add Japanese documents (`ja/docs`)

* docs: add Japanese documents (`ja/codes`)

* docs: add Japanese documents

* Remove pythontutor blocks in ja/

* Add an empty at the end of each markdown file.

* Add the missing figures (use the English version temporarily).

* Add index.md for Japanese version.

* Add index.html for Japanese version.

* Add missing index.assets

* Fix backtracking_algorithm.md for Japanese version.

* Add avatar_eltociear.jpg. Fix image links on the Japanese landing page.

* Add the Japanese banner.

---------

Co-authored-by: krahets <krahets@163.com>

ja/codes/python/chapter_hashing/built_in_hash.py

@@ -0,0 +1,37 @@
+"""
+File: built_in_hash.py
+Created Time: 2023-06-15
+Author: krahets (krahets@163.com)
+"""
+
+import sys
+from pathlib import Path
+
+sys.path.append(str(Path(__file__).parent.parent))
+from modules import ListNode
+
+"""Driver Code"""
+if __name__ == "__main__":
+    num = 3
+    hash_num = hash(num)
+    print(f"整数 {num} のハッシュ値は {hash_num}")
+
+    bol = True
+    hash_bol = hash(bol)
+    print(f"ブール値 {bol} のハッシュ値は {hash_bol}")
+
+    dec = 3.14159
+    hash_dec = hash(dec)
+    print(f"小数 {dec} のハッシュ値は {hash_dec}")
+
+    str = "Hello algorithm"
+    hash_str = hash(str)
+    print(f"文字列 {str} のハッシュ値は {hash_str}")
+
+    tup = (12836, "Ha")
+    hash_tup = hash(tup)
+    print(f"タプル {tup} のハッシュ値は {hash(hash_tup)}")
+
+    obj = ListNode(0)
+    hash_obj = hash(obj)
+    print(f"ノードオブジェクト {obj} のハッシュ値は {hash_obj}")