feat: create scalar tailwind preset

[hwkr]

This creates a Scalar Tailwind preset that defines all our core tailwind configuration. Different projects can extend the preset with more context specific configuration.

Originally the ideas was to export the core tailwind preset from @scalar/themes but I ran into issues with Storybook because importing anything from @scalar/themes tries to import a CSS file which makes Storybook Vite angry.

We probably shouldn't auto load base.css into the page just because someone imports a tailwind preset out of @scalar/themes but I wasn't really sure how to fix that. I'm hoping @amritk might know of a good way to handle it. In the mean time I just split up the configurations / preset so it can be moved over easier as a next step.

[changeset-bot]

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Latest commit: 199edb8

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[relativeci]

#1847 Bundle Size — 1.92MiB (~-0.01%).

199edb8(current) vs f5c6bfd main#1846(baseline)

Warning

Bundle contains 4 duplicate packages – View duplicate packages

Bundle metrics   2 changes 1 improvement

	Current #1847	Baseline #1846
Initial JS	1.92MiB(~-0.01%)	1.92MiB
Initial CSS	0B	0B
Cache Invalidation	100%	0%
Chunks	1	1
Assets	1	1
Modules	1085	1085
Duplicate Modules	0	0
Duplicate Code	0%	0%
Packages	157	157
Duplicate Packages	4	4

Bundle size by type   1 change 1 improvement

	Current #1847	Baseline #1846
JS	1.92MiB (~-0.01%)	1.92MiB

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Bundle analysis report Branch brynn/doc-1864-align-and-merge-t... Project dashboard

[geoffgscott]

LGTM

[marclave]

nice work @hwkr lets get this in so we can iterate and have an amazing foundation

[github-actions]

Preview deployed to https://b95e8b01-65dd-4438-a4be-db0f8d24f070--scalar-deploy-preview.netlify.app