Readme has yarn hardhat:test duplicated

[Pabl0cks]

After #808 we got yarn hardhat:test twice in the readme. I think we can delete first sentence (old reference)

Run smart contract test with `yarn hardhat:test`

**What's next**:

- Edit your smart contract `YourContract.sol` in `packages/hardhat/contracts`
- Edit your frontend homepage at `packages/nextjs/app/page.tsx`. For guidance on [routing](https://nextjs.org/docs/app/building-your-application/routing/defining-routes) and configuring [pages/layouts](https://nextjs.org/docs/app/building-your-application/routing/pages-and-layouts) checkout the Next.js documentation.
- Edit your deployment scripts in `packages/hardhat/deploy`
- Edit your smart contract test in: `packages/hardhat/test`. To run test use `yarn hardhat:test`