Site layout refactor

[colegoldsmith]

Lots of updates here, mainly removing a lot of the default UI styles and re-writing the UI template files with tailwind classes. I'll try to list the notable changes:

• Overhaul and removal of many default UI css files, optimized for tailwind
• Overhaul the left nav and top nav. It now uses a drawer style component for the mobile view
• Left nav is refactored an restyled to allow deeply nested items
• Page content is now centered on wide screens
• Page content is optimized to squish as little as possible for each screen width breakpoint
• Removal of stylelint as it is now unsupported and clashes with prettier.

[mlr]

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