Refactoring List.jsx for readability and maintenance

[krsnamara]

Summary

Currently the List.jsx file is quite large. The goal of this issue is to try and abstract some of the logic into a utils file and create some components that can be used to make file more manageable.

Acceptance criteria

• Create utils file that handles sorted logic
• Create component for entering new Item
• Separate the sorting data jsx into its own component
• Use the sortedData utils file to effectively filtered data and sort into urgency arrays

Notes

Sub-issue of #14