[ENHANCEMENT] Dashboard navigation is not responsive.

[lazycipher]

Describe the enhancement you'd like
The navbar(sidebar) on the dashboard isn't responsive and should hide on mobile devices and show only when the user clicks on a hamburger menu icon.

Describe approaches if you have thought of any
I would hide the sidebar using CSS and show on user click by toggling show state(which in turn changes className).
There's an issue apart from responsiveness and that is we're not keeping whole navigation-related code in Navigation.js but we have a navigation wrapper kept in

social-platform-donut-frontend/src/user/dashboard/dashboard.js

Line 62 in 01e9575

<div className="navigation">

We've to move this wrapper to Navigation.js and then apply some media queries.

Additional context
This will be resolved in #641

[lazycipher]

fixed in #641