docs: Add Chinese documentation for github page.

exampleSite/config/_default/languages.zh-CN.toml

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+languageCode = "zh-CN"
+languageName = "简体中文"
+languageDirection = "ltr"
+weight = 2
+
+title = "Congo"
+copyright = "© 2023 Congo contributors"
+
+[params]
+  dateFormat = "2006年1月2日"
+
+  mainSections = ["samples"]
+  description = "一款基于Tailwindcss的强大且轻量的Hugo主题"
+
+[author]
+  name = "Congo"
+  image = "img/author.jpg"
+  headline = "非凡的主题！"
+  bio = "这是一个作者简介示例，虽然这里有一张狗的库存照片，但实际上这篇文章是由人创建的。 :dog:"
+  links = [
+    { x-twitter = "https://twitter.com/" },
+    { facebook = "https://facebook.com/" },
+    { linkedin = "https://linkedin.com/" },
+    { youtube = "https://youtube.com/" },
+  ]

exampleSite/config/_default/menus.zh-CN.toml

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+# -- Main Menu --
+# The main menu is displayed in the header at the top of the page.
+# Acceptable parameters are name, pageRef, page, url, title, weight.
+#
+# The simplest menu configuration is to provide:
+#   name = The name to be displayed for this menu link
+#   pageRef = The identifier of the page or section to link to
+#
+# By default the menu is ordered alphabetically. This can be
+# overridden by providing a weight value. The menu will then be
+# ordered by weight from lowest to highest.
+
+[[main]]
+  name = "文档"
+  pageRef = "docs"
+  weight = 10
+
+[[main]]
+  name = "示例"
+  pageRef = "samples"
+  weight = 20
+
+[[main]]
+  name = "用户"
+  pageRef = "users"
+  weight = 30
+
+[[main]]
+  name = "GitHub"
+  url = "https://github.com/jpanther/congo"
+  weight = 40
+  [main.params]
+    icon = "github"
+    showName = false
+    target = "_blank"
+
+[[main]]
+  identifier = "搜索"
+  weight = 99
+  [main.params]
+    action = "search"
+
+[[main]]
+  identifier = "语言"
+  weight = 100
+  [main.params]
+    action = "locale"
+
+# -- Footer Menu --
+# The footer menu is displayed at the bottom of the page, just before
+# the copyright notice. Configure as per the main menu above.
+
+# [[footer]]
+#   name = "标签"
+#   pageRef = "tags"
+#   weight = 10