Docs: ported purgecss from v2

[nullpointerexceptionkek]

Linked Issue

Closes #2881

Description

Ported documentation from v2 docs with updated changes such as Vite 6 config format.

Changsets

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Checklist

Please read and apply all contribution requirements.

• This PR targets the dev branch (NEVER master)
• Documentation reflects all relevant changes
• Branch is prefixed with: docs/, feat/, chore/, bugfix/
• Ensure Svelte and Typescript linting is current - run pnpm ci:check
• Ensure Prettier linting is current - run pnpm format
• All test cases are passing - run pnpm test
• Includes a changeset (if relevant; see above)

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Latest commit: 91ce836

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Name	Status	Preview	Updated (UTC)
skeleton-docs	❌ Failed (Inspect)		Jan 25, 2025 6:34am

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