[Suggestion] Few new features I could prepare PRs for if wanted

Hi there,

I added the following features on [my fork](https://github.com/timiles/HomeMirror/commits/master) - if any are of interest, I'd be happy to polish them up (ie settings into config rather than hard coded, etc) and send pull requests:
- BTC price in USD/GBP (using coindesk);
- foreign currency exchange rates (using yahoo finance);
- custom text scrolling component for news headlines, I found the built-in marquee too slow.

Thanks for all your code so far!
Tim

Review the commits on the linked fork to understand the BTC price, currency exchange, and custom scrolling features. Check which, if any, the maintainer wants, then clarify configuration requirements before preparing a pull request; the issue does not define acceptance criteria or a specific entry point.

Written by the indexing model from the issue text.