Update README.md

Removed the broken link.

7-bank-project/README.md

@@ -16,6 +16,6 @@ In this project, you'll learn how to build a fictional bank. These lessons inclu
 
 These lessons were written with :hearts: by [Yohan Lasorsa](https://twitter.com/sinedied).
 
-If you're interested to learn how to build the [server API](./api/README) used in these lessons, you can follow [this series of videos](https://aka.ms/NodeBeginner) (in particular videos 17 through 21).
+If you're interested to learn how to build the server API used in these lessons, you can follow [this series of videos](https://aka.ms/NodeBeginner) (in particular videos 17 through 21).
 
-You can also take a look at [this interactive Learn tutorial](https://aka.ms/learn/express-api). 
+You can also take a look at [this interactive Learn tutorial](https://aka.ms/learn/express-api).