added global option with icon

[OmChillure]

What does this PR do?

fixes #682

Where should the reviewer start?

Can start from constants/Superteam.ts.

How should this be manually tested?

By going to contstans/Superteam.ts.

Any background context you want to provide?

I added an object inside the array to render a option of Global, to navigate to home page with ease. I also added the icon.

What are the relevant issues?

Once user selects a region, the global option dissapears. this means user has to either remove the extra path on the address bar or reload the bounties/projects page to see the globally available bounties/projects again.

Screenshots (if appropriate)

Before

After