Create Category Management UI

[jschnapper]

Create a page to manage the categories. Please create low-fi or high-fi mockup before implementing. This page will make use of the existing category api endpoints

This is a work in progress in the categories branch

We should be able to list all the categories, add a category, edit a category, and delete a category from the UI

To edit a category, you should be able to select a category in the table, which should pull up a screen or modal to edit that existing category.

To delete a category, you should be able to select the category in the table to delete it. When you delete a category, go through all the existing items and remove that category from those items (use the unique id for the category).

For reference:
The restrictions field is an optional field used to indicate if this category has a "limit," which is referenced on the ordering page. For instance, if you are allowed only 2 items max for a category.

The descriptions can be used to describe what the category is as well as to indicate how to select the item (for instance, rank your choices -- 1 being the highest priority) on the order page.