Misc doc improvements

Full Changelog: v1.1.1...v1.1.2

Improve out-of-range handling

• Improves and documents behavior for large interval etudes on instruments with limited ranges.
• Rearranges UI for better presentation on mobile devices.

Full Changelog: v1.1.0...v1.1.1

v1.1.0

• Adds Up/Down only option for 2 & 3 interval patterns.
• Adds Melodica instrument
• Fixes an error in 2 interval pattern generation
• Updates inline doc

Initial version

This was the first version put onto etudes.ellisandgrant.com. The scale based etudes are going away in the next version. Use this version if you really miss them.