https://aurokk.github.io/guitar 2026-03-29T20:33:39.109Z monthly 1 https://aurokk.github.io/guitar/exercises/fretboard 2026-03-29T20:33:39.109Z monthly 0.8 https://aurokk.github.io/guitar/exercises/interval 2026-03-29T20:33:39.109Z monthly 0.8