Left Navbar implementation

[NicholasLin718]

1. Moved User Login/Core settings to the left navbar
2. Created a new IconButton used for core setting and power on/off of a selected instance
3. Instance information is now displayed on the left navbar above the instance tabs
4. Instance tabs moved to the left navbar, and introduced new routes under /dashboard/{tab_name}. The new default is dashboard/overview
5. New styling for displaying all instances

*Currently, the navbar and user login dropdown have hardcoded widths and will require investigation to determine how we can truncate the username whilst using dynamic width.

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[Ynng]

left nav scrolling is still broken ish,
the buttons in the left nav is missing the blue glowing border on tab
and this:

[Ynng]

• The "power" button doesn't have keybaord focus border
• the "power" button isn't really a square?
• Scrolling behavior of the left nav is still not perfect
• When I change instant, the tab jumps back to /overview, can we keep the current tab

[Ynng]

• The restart button does not have tooltip
• The spacing is different between the restart <-> power button, and user dropdown <-> gear icon

[Ynng]

lgtm!