Highlight root note of each chord

Refactor the Piano component to highlight the root note of each chord. If this
makes things too easy, I can support this as a preference.

Also:
- Reduced the number of keys that the piano displays and increased the key
  thickness to reclaim the space
- Preferred using Tailwind selectors instead of inline styling where applicable
- Call List.reverse on the keys to ensure that the top-most note is a lower note
  than the bottom-most note

TODO:
- Support showing only the name of the chord and not just the notes that
  comprise that chord
- Rewrite the function that generates the chords for a given range of notes
- Consider supporting a dark mode

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