doc: Add ai doc translate tool and add English doc. (#1168)

- add tools/doc_translator.py
- translated docs into English

Signed-off-by: longjin <longjin@DragonOS.org>

docs/index.rst

@@ -3,9 +3,22 @@
    You can adapt this file completely to your liking, but it should at least
    contain the root `toctree` directive.
 
+.. Note: __EXCLUDE_IN_TRANSLATED_START
+
 欢迎来到DragonOS的文档！
 ====================================
 
+.. raw:: html
+
+   <div class="toctree-wrapper compound">
+   <p class="caption" role="heading"><span class="caption-text">Translations</span></p>
+   <ul>
+   <li class="toctree-l1"><a class="reference internal" href="locales/en/index.html">English</a></li>
+   </ul>
+   </div>
+
+.. Note: __EXCLUDE_IN_TRANSLATED_END
+
 .. toctree::
    :maxdepth: 1
    :caption: 入门
@@ -52,6 +65,13 @@
    community/contact/index
    community/ChangeLog/index
 
+.. Note: __EXCLUDE_IN_TRANSLATED_START
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Translations
+
+   locales/en/index
 
 Indices and tables
 ==================
@@ -59,3 +79,5 @@ Indices and tables
 * :ref:`genindex`
 * :ref:`modindex`
 * :ref:`search`
+
+.. Note: __EXCLUDE_IN_TRANSLATED_END