fix duplicate architecture diagram and minor style updates in README

Author: iamsainikhil

README.md

@@ -146,7 +146,7 @@ There are so many weather-related applications out in the wild. So, the goal is
 
 ![Weather React Application Architecture](./Weather_React_Architecture.svg)
 
-### ❕ **Deatiled Architecture Documentation will be added soon...**
+### ❕ **Detailed Architecture Documentation will be added soon...**
 
 ## 🏎 Roadmap