fix: web page

Author: MatrixCQY

src/hooks/use-file-system.ts

@@ -37,19 +37,6 @@ const INITIAL_FILES: Record<string, FileNode> = {
     parentId: null,
     content: `# MathStudio
 
-Welcome to **MathStudio**, a professional Markdown editor designed for mathematics and coding.
-
-## 🚀 How to Publish (For Site Owner)
-
-This website supports a **Static Blog** workflow. As the owner, you can publish articles visible to everyone:
-
-1.  **Write**: Create your article here in the editor.
-2.  **Export**: Click the download icon (⬇️) in the sidebar to save the \`.md\` file.
-3.  **Upload**: Upload the file to the \`src/posts\` folder in your GitHub repository.
-4.  **Deploy**: GitHub Actions will automatically rebuild the site, and your new article will appear for all visitors!
-
----
-
 ## Features Demo
 
 ### 1. LaTeX Support

src/posts/Welcome.md

@@ -1,4 +1,4 @@
-## Features Demo
+# Features Demo
 
 ### 1. LaTeX Support
 Inline: $E = mc^2$