feat: replace nav '教程' with 'Blog' → /blog/

Author: TreeLin

_layouts/home.html

@@ -196,7 +196,7 @@
   <div class="nav-inner">
     <a href="/" class="nav-logo">ModelStudio for Developers</a>
     <div class="nav-links">
-      <a href="/guide/">教程</a>
+      <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>