Add GCP Cloud Run and Render Dgraph self hosting guides

[johnymontana]

No description provided.

[Copilot]

Pull Request Overview

This PR adds comprehensive self-hosting guides for deploying Dgraph on two cloud platforms: Google Cloud Run and Render. The documentation provides step-by-step instructions for deploying Dgraph in standalone mode with persistent storage configurations.

• Reorganizes the Dgraph documentation structure to include a "Dgraph Self-Managed" section
• Adds detailed deployment guide for Google Cloud Run with migration instructions from Dgraph Cloud
• Adds deployment guide for Render platform with security and monitoring considerations

Reviewed Changes

Copilot reviewed 3 out of 15 changed files in this pull request and generated 4 comments.

File	Description
docs.json	Restructures navigation to group self-hosting guides under "Dgraph Self-Managed"
dgraph/self-managed/cloud-run.mdx	Complete deployment guide for GCP Cloud Run including migration steps
dgraph/self-managed/render.mdx	Comprehensive guide for deploying Dgraph on Render with configuration examples

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