Add authorization

[ValentinGenev]

Overview

Research and implement the common ways to authorize the front-end to back-end requests.

References:

• webpack-dev-server vulnerable to DNS rebinding attack webpack/webpack-dev-server#887
• https://enable-cors.org/server_expressjs.html
• https://create-react-app.dev/docs/proxying-api-requests-in-development

DOD

• configure the host;
• enable CORS;
• configure the proxy;