Api call refactor

[rpheredia]

Changes

1. Includes changes from PR#8.
2. Refactor code to remove API calls from components to redux and to use axios package for backend calls.
3. Store results in redux for easy access from any component.

Purpose

Refactoring the code achieves separation of concerns that supports scalability and easier debugging in the future. See issue Shift3#9

Approach

Code is standardized and allow for easier updating and enhancing. Results of redux calls can be accessed more easily from any component.

Testing Steps

1. Verify that adding, editing, viewing and deleting functionalities work properly.

Fixes Shift3#9