all: remove chat group (#165)

Author: changkun

README-zh-cn.md

@@ -2,7 +2,7 @@
 
 # 现代 C++ 教程：高速上手 C++11/14/17/20
 
-![](https://img.shields.io/travis/changkun/modern-cpp-tutorial/master?style=flat-square) [![](https://img.shields.io/badge/language-English-blue.svg?style=flat-square)](./README.md) [![](https://img.shields.io/badge/language-简体中文-red.svg?style=flat-square)](./README-zh-cn.md) [![](https://img.shields.io/badge/€-donate-ff69b4.svg?style=flat-square)](./assets/donate.md) [![](https://img.shields.io/badge/chat-community-667ed5.svg?style=flat-square)](./assets/community.md)
+![](https://img.shields.io/travis/changkun/modern-cpp-tutorial/master?style=flat-square) [![](https://img.shields.io/badge/language-English-blue.svg?style=flat-square)](./README.md) [![](https://img.shields.io/badge/language-简体中文-red.svg?style=flat-square)](./README-zh-cn.md) [![](https://img.shields.io/badge/€-donate-ff69b4.svg?style=flat-square)](./assets/donate.md)
 
 ## 本书目的
 

README.md

@@ -2,8 +2,7 @@
 
 # Modern C++ Tutorial: C++11/14/17/20 On the Fly
 
-![](https://img.shields.io/travis/changkun/modern-cpp-tutorial/master?style=flat-square) [![](https://img.shields.io/badge/language-English-blue.svg?style=flat-square)](./README.md) [![](https://img.shields.io/badge/language-简体中文-red.svg?style=flat-square)](./README-zh-cn.md) [![](https://img.shields.io/badge/€-donate-ff69b4.svg?style=flat-square)](./assets/donate.md) [![](https://img.shields.io/badge/chat-community-667ed5.svg?style=flat-square)](./assets/community.md) 
-
+![](https://img.shields.io/travis/changkun/modern-cpp-tutorial/master?style=flat-square) [![](https://img.shields.io/badge/language-English-blue.svg?style=flat-square)](./README.md) [![](https://img.shields.io/badge/language-简体中文-red.svg?style=flat-square)](./README-zh-cn.md) [![](https://img.shields.io/badge/€-donate-ff69b4.svg?style=flat-square)](./assets/donate.md)
 ## Purpose
 
 The book claims to be "On the Fly". Its intent is to provide a comprehensive introduction to the relevant features regarding modern C++ (before 2020s).

assets/community.md

@@ -8,7 +8,6 @@ all: clean
 	cp ../assets/alipay.jpg ./src/modern-cpp/assets/alipay.jpg
 	cp ../assets/wechat.jpg ./src/modern-cpp/assets/wechat.jpg
 	cp ../assets/donate.md ./src/modern-cpp/about/
-	cp ../assets/community.md ./src/modern-cpp/about/
 	cp -r ../assets/figures ./src/modern-cpp/assets/figures
 	cp -r ../exercises ./src/modern-cpp/
 	cp -r ../code ./src/modern-cpp/
@@ -25,7 +24,6 @@ clean:
 		./src/modern-cpp/assets/alipay.jpg \
 		./src/modern-cpp/assets/wechat.jpg \
 		./src/modern-cpp/about/donate.md \
-		./src/modern-cpp/about/community.md \
 		./src/modern-cpp/code \
 		./src/modern-cpp/exercises \
 		public db.json src/modern-cpp/zh-cn src/modern-cpp/en-us

website/Makefile

@@ -16,7 +16,6 @@
   <ul class="nav-dropdown">
       <li><ul>
       <li><a class="nav-link" href="<%- url_for("/modern-cpp/about/donate.html") %>" >资助</a></li>
-      <li><a class="nav-link" href="<%- url_for("/modern-cpp/about/community.html") %>" >社区</a></li>
       <li><a class="nav-link" href="<%- url_for("/modern-cpp/about/copyright.html") %>" >版权声明</a></li>
       <li><a class="nav-link" href="<%- url_for("/modern-cpp/about/ack.html") %>" >致谢</a></li>
       </ul></li>

website/themes/moderncpp/layout/partials/main_menu.ejs

@@ -16,7 +16,6 @@
 <ul class="nav-dropdown">
     <li><ul>
     <li><a class="nav-link" href="<%- url_for("/modern-cpp/about/donate.html") %>" >Donate</a></li>
-    <li><a class="nav-link" href="<%- url_for("/modern-cpp/about/community.html") %>" >Community</a></li>
     <li><a class="nav-link" href="<%- url_for("/modern-cpp/about/copyright.html") %>" >Copyright</a></li>
     <li><a class="nav-link" href="<%- url_for("/modern-cpp/about/ack.html") %>" >Acknowledgements</a></li>
     </ul></li>