Feat: add network and wallet funding details on readme

[kneerose]

List of changes

• Add network on the host URL
• Add additional details for the testnet faucet fund on readme
• update the wrong value and the env on the env.example

Checklist

• related issue
• My changes generate no new warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the changelog
• I have added tests that prove my fix is effective or that my feature works

[github-actions]

✅ All checks succeeded

[github-actions]

✅ All checks succeeded

[github-actions]

✅ All checks succeeded