refactor: simplify top nav to 岗位能力样板/Blog/案例/GitHub + CTA

Author: TreeLin

_layouts/home.html

@@ -196,10 +196,8 @@
   <div class="nav-inner">
     <a href="/" class="nav-logo">ModelStudio for Developers</a>
     <div class="nav-links">
-      <a href="/blog/">Blog</a>
       <a href="/playbook/">岗位能力样板</a>
-      <a href="/skills/">Skills</a>
-      <a href="/workshop/">Workshop</a>
+      <a href="/blog/">Blog</a>
       <a href="/showcase/">案例</a>
       <a href="https://github.com/modelstudioai" target="_blank">GitHub</a>
       <a href="{{ site.bailian_apikey_url }}" class="nav-cta" target="_blank">获取 API Key</a>