Add self hosted Dgraph guide

[johnymontana]

No description provided.

[Copilot]

Pull Request Overview

This PR adds comprehensive self-hosting documentation for migrating Dgraph databases from managed cloud services (Dgraph Cloud and Hypermode Graph) to self-hosted environments. The guide covers multiple deployment options across major cloud providers and provides detailed operational guidance.

• Adds a new comprehensive self-hosting guide with migration procedures and deployment options
• Includes configuration for AWS EKS, GCP GKE, Azure AKS, and Digital Ocean DOKS deployments
• Provides Docker Compose and Linux VPS deployment alternatives with monitoring and maintenance guidance

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 12 comments.

File	Description
docs.json	Adds the new self-hosted guide to the documentation navigation structure
dgraph/self-hosted.mdx	Creates comprehensive 2184-line guide covering migration planning, data export/import, infrastructure deployment, and operational best practices

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