docs(skill-writer): 更新SKILL.md文档结构

移除了多余的代码块标记，优化了文档格式，
并添加了缺失的引用链接语法以改善文档可读性。

Author: mudssky

ai/coding/claude/skills-dev/skill-writer/SKILL.md

@@ -187,33 +187,10 @@ pip install package-name
 ```
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 ## Advanced usage
 
 For complex scenarios, see [reference.md](reference.md).
 
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 ### Step 7: Add supporting files (optional)
 
 Create additional files for progressive disclosure:
@@ -224,6 +201,7 @@ Create additional files for progressive disclosure:
 **templates/**: File templates or boilerplate
 
 Reference them from SKILL.md:
+
 ```markdown
 For advanced usage, see [reference.md](reference.md).