Summary

• Adds a new reference doc (docs/reference/monitoring-integrations.md) describing how external uptime monitoring services consume django-watchman's health-check endpoints
• Covers 9 vendors (alphabetically): Better Stack, Cronitor, Datadog Synthetics, Panopta, Pingdom, StatusCake, updown.io, Upptime, and UptimeRobot
• Each vendor section follows a consistent structure: description, recommended endpoint, authentication, response interpretation, and vendor documentation link
• Groups the existing API reference and the new page under a "Reference" nav section in mkdocs

Closes #97

Test plan

• Run mkdocs build --strict and verify no warnings or errors
• Run mkdocs serve and verify the new page renders correctly under Reference > Monitoring Integrations
• Verify all external vendor documentation links resolve

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