Resolve .env.example file have not mentioned required environment variables bug and update setup instructions.

[thatbeautifuldream]

Closes #

📑 Description

✅ Checks

• [x] My pull request adheres to the code style of this project
• [ ] My code requires changes to the documentation
• [x] I have updated the documentation as required
• [ ] All the tests have passed

ℹ Additional Information

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
gitstarred	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 31, 2024 3:19am