Add Preference button

[mubaris]

We need to add a preference button on the right side. It will be used for managing usernames.

• [x] Remove username management from the main page
• [x] Add a preference button on the right side. Preferably font-awesome
• [x] Move username management to preference

[vvvdeep]

Hey @mubaris , I can work on this if no one started yet.

[mubaris]

@vvvdeep We appreciate your contributions. But @maiquynhtruong is already working on it. But you can work on #38. It's very easy to do it. Be sure to contact us on Gitter if you have any problems. We always welcome new contributors. Thank you.

[vvvdeep]

Thanks @mubaris . I am starting on #38