feat(nav): add 岗位能力样板 tab to _layouts/home.html

Author: TreeLin

_layouts/home.html

@@ -177,6 +177,7 @@
     <a href="/" class="nav-logo">ModelStudio for Developers</a>
     <div class="nav-links">
       <a href="/guide/">教程</a>
+      <a href="/playbook/">岗位能力样板</a>
       <a href="/skills/">Skills</a>
       <a href="/workshop/">Workshop</a>
       <a href="/showcase/">案例</a>