Comment out usage of hardhat ethers in ethereum service

examples/bri-3/src/bri/zeroKnowledgeProof/services/blockchain/ethereum/ethereum.service.ts

@@ -1,20 +1,23 @@
-import { ethers } from 'hardhat';
 import { readFile, writeFile } from 'fs/promises';
-import { Injectable } from '@nestjs/common';
+import { Injectable, NotImplementedException } from '@nestjs/common';
 import { IBlockchainService } from '../blockchain.interface';
 import { Contract } from 'ethers';
 
 @Injectable()
 export class EthereumService implements IBlockchainService {
   public async deployContract(contractName: string): Promise<void> {
-    const ccsmContract = await ethers.getContractFactory(contractName);
-    const deployedCcsmContract = await ccsmContract.deploy();
-    await this.storeDeployedContractAddress(deployedCcsmContract.address);
+    throw new NotImplementedException();
+    // TODO: We need to use ethers js here for connection, not hardhat ethers
+    // const ccsmContract = await ethers.getContractFactory(contractName);
+    // const deployedCcsmContract = await ccsmContract.deploy();
+    // await this.storeDeployedContractAddress(deployedCcsmContract.address);
   }
 
   async connectToContract(contractName: string): Promise<Contract> {
-    const ccsmContractAddress = await this.getDeployedContractAddress();
-    return await ethers.getContractAt(contractName, ccsmContractAddress);
+    throw new NotImplementedException();
+    // TODO: We need to use ethers js here for connection, not hardhat ethers
+    // const ccsmContractAddress = await this.getDeployedContractAddress();
+    // return await ethers.getContractAt(contractName, ccsmContractAddress);
   }
 
   public async storeAnchorHash(