Change Proxy of Sending Klipfolio Patient Key

[Eric-Alvarez]

Currently, when the application sends a PUT request to Klipfolio, it uses a proxy in order to get around CORS and send a request from the front-end.
This proxy is a third-party site that could go down at any time, so when the application is put into production or for future use, a proxy should be created on the quickforms server that is under the project's control.
The current proxy is just a clone of this github project:
https://github.com/Rob--W/cors-anywhere/
This project should be cloned and hosted on the quickforms server and handle the proxy routing.

The code for sending the patient's key can be seen in this pull request: #91