Update README.md

Summary by CodeRabbit

• Documentation
  • Revised documentation now clearly outlines the app’s enhanced features, including multi-user support, OTP authentication, and collaborative album management.
  • Streamlined installation and configuration instructions detail environment setup, necessary package requirements, and SMTP/email configuration.
  • Expanded usage guidelines provide clear steps for running the web interface, managing image generation outputs, and deploying on Streamlit Cloud.
  • Updated project description to specify it as a Streamlit-based web application with detailed descriptions of user authentication and collaboration features.