New landing page

[chrisglein]

As we're discussing sharing this website with a new audience, it's a natural time to tidy up some UX/usability issues. Specifically, for those looking for a songbook+ experience (lyrics, chords, melody) and don't need all the bells and whistles.

Let's take a look at how it is today:

For the songbook+ audience, entering ABC isn't a necessary scenario. They just want to pick a song. Also, discovering the drop down song selector in the mix of that isn't obvious.

Recommended changes for "lean" mode:

• No multiline text input box for ABC
• No errors indicator e.g. "No errors"
• No commit hash link
• No link to GitHub
• No link to ABC notation (since it isn't shown)

Keep I think?

• Guitar tab checkbox
• Trumpet fingering checkbox
• Transpose option
  • But it'd be better if this was a drop down of the destination key