[Frontend] Implement getCurrentUser method to dynamically load home page

[amlannandy]

Is your feature request related to a problem? Please describe.
Point is add a getCurrentUser method which runs whenever the app loads. It checks if the user is authenticated and if yes, then loads the profile. Then based on authenticated status, home or login page will be loaded.

(This method will call the /user/profile route in the backend)

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Additional context
I'll soon submit a PR for it.