Suggestions to improve clarity of tutorial

[PatBall1]

• [x] check for missing function calls - project_to_geojson, stitch_crowns, clean_crowns
• [ ] clarify how to connect with personal google drive
• [x] clarify Confidence_scores and how filtering should be applied as a post-processing step
• [ ] note to avoid redownloading models as this impacts bandwidth
• [ ] add illustrations of training data, outputs etc
• [ ] explain the early stopping mechanism in more detail