resolve #5, 使用 hexo 编译网站

website/src/modern-cpp/about/copyright.md

@@ -0,0 +1,9 @@
+---
+title: 版权声明
+type: about
+order: 1
+---
+
+<a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/4.0/"><img alt="知识共享许可协议" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-nd/4.0/80x15.png" /></a>
+
+本书系[欧长坤](https://github.com/changkun)著，采用[知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议](http://creativecommons.org/licenses/by-nc-nd/4.0/)许可。项目中代码使用 [MIT](https://opensource.org/licenses/MIT) 协议开源。

website/src/modern-cpp/images/lang/cn.svg

@@ -0,0 +1,9 @@
+<svg width="80" height="60" viewBox="0 0 80 60" xmlns="http://www.w3.org/2000/svg">
+  <title>
+    chi
+  </title>
+  <g fill-rule="nonzero" fill="none">
+    <path fill="#DE2910" d="M0 0h80v60H0"/>
+    <path d="M9.414 23.755l5.13-17.35 5.133 17.35-13.44-10.737h16.617M32.14 6.622L26.3 8.124l4.083-4.438-.77 5.682-2.845-4.752M37.76 14.405l-5.968-.88 5.485-2.507-2.912 4.94-.78-5.484M36.745 24.76l-5.088-3.238 6.03-.05-4.674 3.32 1.527-5.324M29.988 31.642l-3.444-4.95 5.583 2.28-5.594 1.26 3.463-4.324" fill="#FFDE00"/>
+  </g>
+</svg>

website/src/modern-cpp/images/lang/de.svg

@@ -0,0 +1,10 @@
+<svg width="80" height="60" viewBox="0 0 80 60" xmlns="http://www.w3.org/2000/svg">
+  <title>
+    deu
+  </title>
+  <g fill-rule="nonzero" fill="none">
+    <path fill="#FFE600" d="M0 40h80v20H0"/>
+    <path fill="#000" d="M0 0h80v20H0"/>
+    <path fill="#F00" d="M0 20h80v20H0"/>
+  </g>
+</svg>

website/src/modern-cpp/images/lang/en.svg

@@ -0,0 +1,17 @@
+<svg width="80" height="60" viewBox="0 0 80 60" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+  <title>
+    ebr
+  </title>
+  <defs>
+    <path id="a" d="M0 0h80v60H0z"/>
+  </defs>
+  <g fill="none" fill-rule="evenodd">
+    <mask id="b" fill="#fff">
+      <use xlink:href="#a"/>
+    </mask>
+    <use fill="#006" fill-rule="nonzero" xlink:href="#a"/>
+    <path d="M0 0v6.708L71.056 60H80v-6.708L8.944 0H0zm80 0v6.708L8.944 60H0v-6.708L71.056 0H80z" fill="#FFF" fill-rule="nonzero" mask="url(#b)"/>
+    <path d="M32.873 0v60h13V0h-13zM0 22.93V37h80V22.93H0z" fill="#FFF" fill-rule="nonzero" mask="url(#b)"/>
+    <path d="M0 25.762v8h80v-8H0zM35 0v60h8V0h-8zM.03 59.194L28.61 37H35L6.42 59.194H.03zM.03 0l31 23h-6.932L.03 5.143V0zM46 22.194L74.58 0h6.39L52.39 22.194H46zM80 60L49 37h6.932L80 54.857V60z" fill="#C00" fill-rule="nonzero" mask="url(#b)"/>
+  </g>
+</svg>