Use useStaticJson hook from scaffold-eth instead of using one rpc url

[technophile-04]

Current :

We are just using one static rpc-url and sometimes the eth-price is not populated if it's down also it burdens the one rpc node.

const scaffoldEthProvider = new StaticJsonRpcProvider("https://rpc.scaffoldeth.io:48544");

Proposed solution :

use useStaticJsonRpc hook from scaffold-eth to pick suitable rpc from given rpc's url array and inturn decreases the load on one rpc.