docs: Add CI/CD implementation guide

[agusayerza]

This PR introduces a new implementation guide for setting up CI/CD pipelines for Nango integrations.
The guide covers:

• Workflow Overview: A high-level look at the build, test, and deploy stages.
• GitHub Actions Example: A complete, commented workflow file for automating integration deployment.
• Key Steps: Detailed explanations for checking out code, installing dependencies, building integrations, running tests, and deploying to Nango.

This documentation will help users automate their development lifecycle, ensuring integrations are tested and deployed consistently.

NAN-4532

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CI/CD documentation guide and navigation adjustments

Adds a dedicated CI/CD for Nango Integrations guide covering multi-stage deployments, secret management, GitHub Actions automation, and testing recommendations. Updates docs/docs.json to include the new guide in the Building integrations navigation group, while also removing the entire Reference anchor block from the navigation structure.

Key Changes

• Introduced docs/implementation-guides/building-integrations/ci-cd.mdx with workflow overview, GitHub Actions example, destructive deploy guidance, and testing recommendations.
• Registered the new guide in docs/docs.json under implementation-guides/building-integrations.
• Removed the Reference anchor (including HTTP API, SDK, and CLI navigation entries) from docs/docs.json.

Affected Areas

• docs/implementation-guides/building-integrations/ci-cd.mdx
• docs/docs.json

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This summary was automatically generated by @propel-code-bot

[linear]

NAN-4532 Implementation guide for using Nango in CI

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📊 2 files reviewed • 4 need attention

⚠️ Needs Attention:

• docs/implementation-guides/building-integrations/ci-cd.mdx — Guide on CI/CD implementation may influence deployment security.

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