Add linking and references guide

[ethanpalm]

Created a comprehensive guide on linking and references in documentation, covering internal links, anchor links, API endpoint references, and link maintenance best practices. Added the new guide to the Best practices section in the Guides navigation.

Files changed:

• guides/linking-and-references.mdx - New comprehensive guide on linking strategies
• docs.json - Added new page to Best practices group navigation

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Note

Adds a new docs best-practice guide and wires it into navigation.

• New guides/linking.mdx covering internal links, anchor links, external links, API endpoint references, redirects, and broken-link checks
• Updates docs.json to include guides/linking in the Guides → Best practices group
• Updates guides/index.mdx to list and describe the new Linking guide

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