Register and Login form response #54 #41 #36

[VictorAZ12]

Description

Integrated register/login form server response.

Type of change

• [x] New backend feature: return a JSON response and an HTTP code to front end after form submission.
• [x] New frontend feature: in index page, at login/register form, display the response after form submission, and clear the displayed message box when appropriate

  How Has This Been Tested?

• [x] Manual examination on the page /index using Chrome
• [ ] Automated test

[Jackieljq]

While testing, found an issue where the application failed to run correctly after deployment. The reason is that the requirements.txt file was not updated.

• [x] Solution: Make sure requirements.txt file is updated after merging this pull request.