Add default values for env variables

[ghost]

✅ REACT_APP_CHAIN_ID Optional. Defaults to 1.

✅ REACT_APP_COLLECTION_TOKEN Required.

✅ REACT_APP_CURRENCY_TOKEN Optional. Should default to WETH

✅ REACT_APP_COLLECTION_NAME we could derive from alchemy Optional. Should default to name derived from alchemy

✅ REACT_APP_COLLECTION_IMAGE Optional. Is derived from alchemy. Added new fallback image.

✅ REACT_APP_RPC_URL_1 Optional. Defaults to airswap/utils

✅ REACT_APP_WALLET_CONNECT_PROJECT_ID Optional. No wallet connect button if undefined.

✅ REACT_APP_ALCHEMY_API_KEY Required.

✅ REACT_APP_STORAGE_SERVER_URL Required.