Add navigator mode link

Author: jondy

pyarmor/ask/en/index.html

@@ -12,7 +12,10 @@
       <div class="card border-light mx-5 my-2">
         <div class="card-body">
           <h5 class="card-title">Ask Pyarmor</h5>
-          <button class="btn btn-light btn-sm zh">中文</button>
+          <button class="btn btn-light zh">中文</button>
+          <a href="../../learn/en/ask.html#ask"
+             class="btn btn-light mx-5">Navigation Mode</a>
+          <button class="btn btn-light" disabled>Talk Mode</button>
         </div>
       </div>
 

pyarmor/ask/zh/index.html

@@ -12,7 +12,10 @@
       <div class="card border-light mx-5 my-2">
         <div class="card-body">
           <h5 class="card-title">Pyarmor 解惑</h5>
-          <button class="btn btn-light btn-sm en">English</button>
+          <button class="btn btn-light en">English</button>
+          <a href="../../learn/zh/ask.html#ask"
+             class="btn btn-light mx-5">导航模式</a>
+          <button class="btn btn-light" disabled>对话模式</button>
         </div>
       </div>
       <div class="card mx-5 my-3">