homepage: add Blog to hero actions (EN + zh-CN)

User feedback: blog link isn't visible above the fold. Adding it as a 3rd minimal CTA next to Install guide / GitHub gives a persistent entry point on both locales.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: ritabratamaiti

src/content/docs/index.mdx

@@ -15,6 +15,10 @@ hero:
       link: /install/
       icon: right-arrow
       variant: minimal
+    - text: Blog
+      link: /blog/
+      icon: open-book
+      variant: minimal
     - text: View on GitHub
       link: https://github.com/BrowyHQ
       icon: external

src/content/docs/zh-cn/index.mdx

@@ -15,6 +15,10 @@ hero:
       link: /zh-cn/install/
       icon: right-arrow
       variant: minimal
+    - text: 博客
+      link: /zh-cn/blog/
+      icon: open-book
+      variant: minimal
     - text: 在 GitHub 上查看
       link: https://github.com/BrowyHQ
       icon: external