feat: rename zh-cn to zh-hans and zh-tw to zh-hant

exampleSite/content/docs/configuration/index.ja.md

@@ -54,8 +54,8 @@ Congoは現在、以下の言語に対応しています:
 | :egypt: Arabic                          | `ar`    |
 | :bangladesh: Bengali                    | `bn`    |
 | :bulgaria: Bulgarian                    | `bg`    |
-| :cn: Chinese - Simplified (China)       | `zh-cn` |
+| :cn: Chinese - Simplified (China)       | `zh-hans` |
-| :taiwan: Chinese - Traditional (Taiwan) | `zh-tw` |
+| :taiwan: Chinese - Traditional (Taiwan) | `zh-hant` |
 | :flag-cz: Czech                         | `cs`    |
 | :netherlands: Dutch                     | `nl`    |
 | :finland: Finnish                       | `fi`    |

exampleSite/content/docs/configuration/index.md

@@ -54,8 +54,8 @@ The theme currently supports the following languages out of the box:
 | :egypt: Arabic                          | `ar`    |
 | :bangladesh: Bengali                    | `bn`    |
 | :bulgaria: Bulgarian                    | `bg`    |
-| :cn: Chinese - Simplified (China)       | `zh-cn` |
+| :cn: Chinese - Simplified (China)       | `zh-hans` |
-| :taiwan: Chinese - Traditional (Taiwan) | `zh-tw` |
+| :taiwan: Chinese - Traditional (Taiwan) | `zh-hant` |
 | :flag-cz: Czech                         | `cs`    |
 | :netherlands: Dutch                     | `nl`    |
 | :finland: Finnish                       | `fi`    |

exampleSite/content/docs/configuration/index.zh-hans.md

@@ -54,8 +54,8 @@ Congo 针对完整的多语言网站进行了优化，并且主题assets中已
 | :egypt: 阿拉伯语                         | `ar`    |
 | :bangladesh: 孟加拉语                   | `bn`    |
 | :bulgaria: 保加利亚语                   | `bg`    |
-| :cn: 中文 - 简体（中国）                 | `zh-cn` |
+| :cn: 中文 - 简体（中国）                 | `zh-hans` |
-| :taiwan: 中文 - 繁体（台湾）             | `zh-tw` |
+| :taiwan: 中文 - 繁体（台湾）             | `zh-hant` |
 | :flag-cz: 捷克语                         | `cs`    |
 | :netherlands: 荷兰语                    | `nl`    |
 | :finland: 芬兰语                         | `fi`    |