docs: fix readme link

Author: kemuru

web/README.md

@@ -2,7 +2,7 @@
 
 ### Pre-Requisites
 
-If you haven't already, you need to follow all the previous steps of the **Contributing** section of the repo's [README](if%20you%20haven%27t%20already,%20you%20need%20to%20follow%20all%20the%20steps%20from%20%22Contributing%22%20section%20of%20the%20repo%27s%20README.)
+If you haven't already, you need to follow all the previous steps of the **Contributing** section of the repo's [README](https://github.com/kleros/kleros-v2/blob/master/README.md#contributing)
 
 ### Getting Started