Bug fixes and improvements (#1627)

* Update Copyright 2024 to 2025.

* Fix the flex of .profile-cell for mobile devices.

* Update performance_evaluation.md

* 抛出 -> 给出

* Sync zh and zh-hant version.

* Improve the landing page of the English version.

* Bug fixes

* Fix readme-typing-svg

* Update readme-typing-svg

* Bug fixes

* sync zh and zh-hant versions.

zh-hant/codes/python/chapter_stack_and_queue/linkedlist_deque.py

@@ -69,7 +69,7 @@ class LinkedListDeque:
             val: int = self._front.val  # 暫存頭節點值
             # 刪除頭節點
             fnext: ListNode | None = self._front.next
-            if fnext != None:
+            if fnext is not None:
                 fnext.prev = None
                 self._front.next = None
             self._front = fnext  # 更新頭節點
@@ -78,7 +78,7 @@ class LinkedListDeque:
             val: int = self._rear.val  # 暫存尾節點值
             # 刪除尾節點
             rprev: ListNode | None = self._rear.prev
-            if rprev != None:
+            if rprev is not None:
                 rprev.next = None
                 self._rear.prev = None
             self._rear = rprev  # 更新尾節點