README missing instruction: app must be run from project root, not dashboard folder

[sakicansev]

Bug Report

When following the README to run the Streamlit dashboard,
users may naturally navigate into the dashboard/ folder
and run:

streamlit run On-chain.py

This causes a FileNotFoundError because the app uses a
relative path dashboard/bitpolito_logo.png which only
resolves correctly from the project root.

Steps to reproduce

cd dashboard
streamlit run On-chain.py
# FileNotFoundError: dashboard/bitpolito_logo.png

Expected fix

The README should clearly instruct users to run the app
from the project root:

streamlit run dashboard/On-chain.py

Environment

• macOS
• Python 3.12
• Streamlit 1.52.2