Improve DeepSqueak Documentation

[DrCoffey]

DeepSqueak documentation could be improved.

• [ ] Create documentation for general workflow
• [ ] Create documentation for clustering & clustering GUI
• [ ] Create documentation for manual detection review
• [ ] Create example documentation for training a new detection network
• [ ] Create example documentation for training a new supervised classification network
• [ ] Add mouseover text to buttons? (edit TooltipString in guide)