First time visitor closing AuthScreen renders WelcomeScreen

[zkarmi]

Issue

Spinning this off of #1930 per discussion with @RodriSanchez1:

When a new user to the site visits the root path (/), the WelcomeScreen component is rendered.
#1930 aims to make the AuthScreen (/login-signup) Close (X) button send the user to / if they do not have any browsing history on the app. In this case, closing the AuthScreen via this button renders WelcomeScreen because isFirstVisit && !isLogged is true, when sending the user to /board/root makes more sense:

cboard/src/components/App/App.component.js

Lines 84 to 90 in 1a7e0a9

	<Route
	exact
	path="/"
	component={
	isFirstVisit && !isLogged ? WelcomeScreen : BoardContainer
	}
	/>

Steps to reproduce from AuthScreen:

1. Visit /login-signup
2. Run localStorage.removeItem('persist:root') from console
3. Reload page
4. Click X button in top left

Expected Behavior

User is redirected to the root board, similarly to if selecting "Skip for now" from WelcomeScreen.

Actual Behavior

User is shown WelcomeScreen, which is redundant.

cboard-firsttimevisitor-close-authscreen.mov

[Harshitraaaj]

Assign This issue To me ,, I can fix this .

[RodriSanchez1]

@Harshitraaaj Hi! Welcome to the Cboard project. I just assigned the issue to you! Thanks

[Harshitraaaj]

@RodriSanchez1 Bro look at my pull req.