update readme.md

Author: andremalveira

README.md

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 ## <p align="center">Example API structure in PHP - MVC with Database Firebase for deployment in Vercel </p>
 <p align="center">
-  <a href="#astroanut-hi"><img src="public/banner.png" alt="Hi!!"/></a>
+  <a href="#php+firebase+vercel"><img src="public/header.png" alt="Hi!!"/></a>
 </p>
 
 ## Example JSON Structure in Database Firebase