fix: add InfoBox for usage of userscript generator

Author: gera2ld

content/posts/features-in-userscript-generator.md renamed to content/posts/features-in-userscript-generator.mdx

@@ -6,7 +6,9 @@ path: /posts/features-in-userscript-generator/
 
 [Userscript Generator](https://github.com/violentmonkey/generator-userscript) is a Yeoman generator to quickly initiate a new project for a userscript.
 
+<InfoBox>
 See [Using modern syntax](/guide/using-modern-syntax/) for the usage.
+</InfoBox>
 
 In this post we will dive into each feature and see why and how we use it, and whether we have different choices.