chore: adjust header logo size

Updated image height in README for branding.

readme.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <a href="https://roadmap.sh/"><img src="https://roadmap.sh/img/brand.png" height="120"></a>
+  <a href="https://roadmap.sh/"><img src="https://roadmap.sh/img/brand.png" height="70"></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">