docs: add Enterprise GitHub integration guide

[rajshah4]

Summary

• add a dedicated Enterprise GitHub integration guide
• document GitHub App creation, installation, permissions, Admin Console configuration, and resolver prerequisites
• explain bot versus user identity for acknowledgements, reviews, and completion comments
• explain how resolver conversations load the baseline GitHub skill alongside repository, organization, and task-specific skills
• distinguish agent behavior that skills can guide from integration-owned behavior, using pull request reviews as one example
• add troubleshooting for OAuth layout mismatches, duplicate GitHub App installations, ignored mentions, review identity, and completion comments
• add the guide to Enterprise navigation and link it from the Quick Start

Source Verification

Documentation claim	Source
The helper configures the DNS-aware OAuth callback, webhook URL, permissions, and subscribed events	create_github_app.py
Resolver triggers include the openhands issue label, issue comments, PR comments, and inline review comments	github_view.py
The triggering user must have write access and a linked OpenHands account	github_manager.py
Resolver conversations load public, project, and organization skills	app_conversation_service_base.py
The GitHub resolver prompt mentions GitHub APIs, the public GitHub skill has a github trigger, and SDK trigger matching runs against the rendered user message	pr_update_initial_message.j2, skills/github/SKILL.md, agent_context.py
Resolver reactions and status comments use the GitHub App installation token	github_manager.py
The conversation receives the triggering user's GitHub provider token	github_manager.py
Resolver views request a final summary for every supported trigger	github_view.py
The callback processor posts that final response back to GitHub	github_v1_callback_processor.py

Validation

• git diff --cached --check — passed
• python3 -m json.tool docs.json — passed
• npx --yes --package=node@22 --package=mintlify@latest -c 'mint broken-links' — passed, no broken links
• uv run --with pytest --with requests --with pyyaml pytest -q tests/ — 35 passed; two existing pricing tests errored because their upstream raw GitHub URL returns HTTP 404

This pull request was created by an AI agent (OpenHands) on behalf of Rajiv Shah.

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