Add feature release process guide

[mintlify]

Created a comprehensive guide documenting Mintlify's feature release workflow based on commit history analysis. The guide covers the complete release process from development through documentation, translation, and publication.

Files changed:

• guides/feature-releases.mdx - New guide documenting the feature release process
• docs.json - Added page to Best practices navigation
• guides/index.mdx - Added link to new guide in Best practices section

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Note

Low Risk
Low risk documentation-only change that adds a new guide and links it into navigation; main risk is broken links or navigation ordering issues.

Overview
Adds a new guide page, guides/feature-releases.mdx, documenting Mintlify’s end-to-end feature release workflow (drafting, review, translation, publication) and recommended documentation patterns.

Updates docs.json and guides/index.mdx to include the new Feature release process page under the Best practices section so it appears in site navigation.

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