Enhance Add Idea Suggestions

[wilrnh]

Replace text fields on the "Add Idea" page with the ones presented in the hackathon slides: https://docs.google.com/presentation/d/1lNCymMy0ETSSGf2lzT6ZHuAFdfmJjJmhsC8cKllymOY/edit#slide=id.g2d6e0ded3cb_0_24

1. Inspiration: describe the problem that you would like to solve
2. Innovation: describe your unique solution
3. Requirements: provide a high-level technical shopping-list for volunteers to know what they can help you with
4. MVP: describe what you will ship at the end of the hackathon

For the first iteration, its OK to concatenate all the above into the current "description" database field.