chore: update readme.md

README.md

@@ -8,7 +8,7 @@ Yet another Nginx Web UI, developed by [0xJacky](https://jackyu.cn/) and [Hintay
 
 [![Build and Publish](https://github.com/0xJacky/nginx-ui/actions/workflows/build.yml/badge.svg)](https://github.com/0xJacky/nginx-ui/actions/workflows/build.yml)
 
-# Documentation
+## Documentation
 To check out docs, visit [nginxui.com](https://nginxui.com).
 
 ## Stargazers over time