ci(docs): copy changelog to English docs directory

Author: RicardoRyn

.github/workflows/docs.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
       - uses: actions/configure-pages@v5
       - uses: actions/checkout@v5
-      - run: cp CHANGELOG.md docs/changelog.md
+      - run: cp CHANGELOG.md docs/zh/changelog.md && cp CHANGELOG.md docs/en/changelog.md
       - uses: actions/setup-python@v5
         with:
           python-version: 3.x