Add Dark Mode

[askdkc]

No description provided.

[what-the-diff]

• Changed the background color of the header to gray-800
• Changed text color in header from black to white
• Added dark:bg-gray-700 class for div with px and py classes, so that it has a darker background than its parent element (which is also given a bg)
• Removed pointer events none on this same div as well because we want users to be able to click inside it now that there's no overlay anymore
• Made label have hover state when hovered over by adding dark:hover:text-cyan600 class which changes text cyan 600 when hovered over instead of indigo 300 like before