chore: code review

[reenphygeorge]

Summary of changes I made

1. Containerized the entire code base. Now it can be started by just one command - docker compose up
2. Changed the structure of project minimizing repetition and added global connection support. (router - handler based structure)
3. Added a file based logger for better log collection (good for production)
4. Changed to env file instead of hard coding credentials
5. Proper error handling is done
6. Code is commented at necessary parts

Suggestions

1. Instead of using raw query, an ORM (like Prisma or GORM) would be better as it is more safe for production
2. Swagger docs would be better as it would provide a good api docs (helpful for frontend team)