Snippets anywhere

[k-finken]

Documentation changes

Update the docs to add detail around custom snippet directories (has not shipped yet, will ship very soon).

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Note

Adds documentation for configuring additional snippet directories in docs.json and updates related import guidance.

• Reusable snippets (create/reusable-snippets.mdx):
  • Add Snippet locations and Custom snippet directories with docs.json snippets glob support, examples, and import paths.
  • Clarify that files in snippet dirs aren’t standalone pages; updated tip to include custom paths.
  • Update pre-condition to allow custom snippet directories; add keyword.
• React components (customize/react-components.mdx):
  • Update importing guidance to allow components from any configured snippet directory; link to custom snippet directories.
• Settings reference (organize/settings.mdx):
  • Add new "snippets" array field to docs.json reference with example and link to reusable snippets.

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[ethanpalm]

closing for #2363