Fix error link

Author: jondy

pyarmor/index.html

@@ -35,7 +35,7 @@ <h5 class="card-title text-center">Try</h5>
           <div class="card">
             <div class="card-body">
               <h5 class="card-title text-center">Ask</h5>
-              <a href="learn/en/index.html" class="btn btn-light">
+              <a href="ask/en/index.html" class="btn btn-light">
                 Something is wrong, or something is not ure, ask Pyarmor
               </a>
             </div>
@@ -45,7 +45,7 @@ <h5 class="card-title text-center">Ask</h5>
           <div class="card">
             <div class="card-body">
               <h5 class="card-title text-center">Docs</h5>
-              <a href="learn/en/index.html" class="btn btn-light">
+              <a href="try/en/index.html" class="btn btn-light">
                 Pyarmor 9.1 new features online documentation
               </a>
             </div>
@@ -81,7 +81,7 @@ <h5 class="card-title text-center">在线试用</h5>
           <div class="card">
             <div class="card-body">
               <h5 class="card-title text-center">答疑解惑</h5>
-              <a href="learn/zh/index.html" class="btn btn-light">
+              <a href="ask/zh/index.html" class="btn btn-light">
                 当出现问题需要解决的时候，或者对某些功能有疑惑，在这里答疑解惑
               </a>
             </div>
@@ -91,7 +91,7 @@ <h5 class="card-title text-center">答疑解惑</h5>
           <div class="card">
             <div class="card-body">
               <h5 class="card-title text-center">文档</h5>
-              <a href="learn/zh/index.html" class="btn btn-light">
+              <a href="try/zh/index.html" class="btn btn-light">
                 Pyarmor 9.1 新功能的在线文档
               </a>
             </div>