Add Fund Model and Basic Edit/Listing Screen

[alexfinnarn]

Now that a basic image upload works, add a basic "Fund" model fitting it on "Post" for the fund so that the Post can be used for display purposes and the Fund model can just pertain to core fund details like allocation code.

I might as well add react-table for listing the content.

AC:

• [x] Fund model created with needed fields from giving.cu.edu. No need to store data that can be derived from other fields, like campus can be derived from allocation code.
• [x] Fund model has attached "Post" after creation.
• [ ] "Fund Detail" and "Post" have separate tabs to work off of.
• [x] react-table added to dependencies

[alexfinnarn]

I'm going to add Tailwind CSS since it has so many useful examples vs. theme-ui and complete some of this stuff in another issue.