fix(navbar): Make Navbar mobile-friendly

[ghost]

Fixes #2117.

Changes proposed in this pull request:

• Navbar becomes bare minimum when Sidebar goes away at a certain browser width.
• Add a hamberger menu for the bare minimum version, with the same menu items as the Sidebar.

Please note:
Some updates are wanted in the Components repo later.

• Link list can display an icon and a text
• Link list can show a divider
• Use Font Awesome's bars icon

[gitpod-io]

[vercel]

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[matteovivona]

Mmh I don't see bars icon. I've tried both on Safari iOS, Safari macOS and Firefox.

[ghost]

Mmh I don't see bars icon. I've tried both on Safari iOS, Safari macOS and Firefox.

@tehkapa Yes, currently, it's only displaying the downward arrow at very left of the navbar. Please click on the arrow to open up the dropdown menu.

Some updates are wanted in the Components repo later:

• Link list can display an icon and a text
• Link list can show a divider
• Use Font Awesome's bars icon