Expose Remaining DB Producer content to Producer Page

[rhodges]

for producers on the Producer Details pages:

• [x] Expose Liability Insurance
• [x] Order Minimum: Keep
• [x] Delivery Minimum: Drop
• [x] Capacity: Drop
• [x] "Last Updated": Keep
• [x] Only show date: note time
• [x] Sold to school before: Boolean (expose)
• [x] Schools sold to:
• [x] Text box (or list) (or separate model)
• [x] Preferred Language: Add
• [x] Preferred Contact method: Add
• [x] Preferred season for contact: Drop
• [x] Additional Notes: Add
• [ ] Boilerplate field to be added to single Producer page in wagtail Streamfield