Fix bug in base_url inside authentication.js file

[chidimo]

What does this PR do?

Fix bug in base_url inside authentication.js file

Description of Task to be completed?

• Set const base_url = 'https://qcredit.herokuapp.com/api/v1'

How should this be manually tested?

1. Clone the repo
2. Open /UI/authentication.html in a browser
3. Click the sign in or sign up tab.
4. Enter the required credentials. You should be redirected to your dashboard, which will have up to date information coming from the api backend server. This data persists on all pages.

Any background context you want to provide?

Nil

What are the relevant pivotal tracker stories?

166280668

Screenshots (if appropriate)

Nil

Questions:

Nil