Fixed stock price acquisition and css font

Fixed request

Changed requests-setup to fix get-prices

Changed relation to screenshot.jpg so that dockerhub can access it

RapidAPI-account NO LONGER NECESSARY, switched to publicly available …

…information via 'yfinance' library by Ran Aroussi.

Also switched from Dash native server to more robust waitress-server.

Added Basic Auth

Update README.md

Update README.md