Adds alt text for field guide and tutorial images.
Fix tutorial reading order.
Fix tabbing to hidden form inputs.
Add ARIA landmark roles.
Add ARIA states and roles for tabbed navigation in main nav, field guide and tutorial.
Allow for quick tabbing through the decision tree when classifying.
Adds alt text for field guide and tutorial images. Fix tutorial reading order. Fix tabbing to hidden form inputs. Add ARIA landmark roles. Add ARIA states and roles for tabbed navigation in main nav, field guide and tutorial. Allow for quick tabbing through the decision tree when classifying.