Update README.md

Update README.md: Revise demo video link, enhance installation instructions, and streamline feature descriptions. Remove outdated example prompts and clarify backend technology version.

Update README and app.py: removed expense tracking references from the financial advisory agent description and example prompts for clarity and focus on budgeting and investment recommendations.

Enhance financial tools error handling: added fallback for stock price retrieval, improved exception handling for individual stock errors, and updated README formatting for clarity.

Refactor financial tools: removed expense tracker functionality, updated budget planner keywords, and improved README with new tags and demo video link.

Update README.md to enhance project description, add detailed features, installation instructions, example prompts, and technical architecture for the Financial Advisory Agent. Changed emoji and color scheme for better representation.

initial commit