rewrite docs

[NickleDave]

• make index / landing page much less wordy
• fix reference to "songdeck" at bottom of landing page
• have a formats section -- do not hide in reference
• "use crowsetta with your format" should go into how-tos and it should not be the first how-to; first should be on converting to 'simple-seq' format
• "tutorial" currently under "table of contents" should get its own section
• "finding out what formats are built-in" should be a how-to, and it should be done in passing in the tutorial

[NickleDave]

landing page structure should be:

• elevator pitch + features list
• install
• quickstart
  • use built-in data here
• Bug reports and feature requests
• Need help?
  • link to vocalpy forum
• contributing
  • link to vocalpy CoC
• How to Cite
• License and credits

[NickleDave]

• overall sections
  • formats
    • don't want to hide these in a "reference" since they are kind of the main point
  • user guide
  • reference
    • API
      • want to make sure the interface is surfaced in the docs somehow
    • background (?)
      • anything that is not format specific but more like "why does this package exist"

not sure how much typical sections I think of like "getting started/tutorial", "howtos", make sense here since the functionality is in some ways very targeted

[NickleDave]

• use furo theme but with always-light hack that pandera has?