Make logo clickable (#7891)

Clickable logo

readme.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <img src="public/images/brand.png" height="128">
+  <a href="https://roadmap.sh/"><img src="public/images/brand.png" height="128"></a>
   <h2 align="center"><a href="https://roadmap.sh">roadmap.sh</a></h2>
   <p align="center">Community driven roadmaps, articles and resources for developers<p>
   <p align="center">