docs: add Rootly incident management integration page

[MikaKerman]

Summary

• Adds a new docs page for the Rootly incident management integration (cloud/integrations/alerts/rootly.mdx), mirroring the structure of the existing incident.io integration page.
• Covers: creating a Generic Webhook Alert Source in Rootly, connecting it in Elementary, mapping alert fields, configuring auto-resolution, routing alerts to a target, available fields, and how alerts/dedup work.
• Registers the new page in docs.json nav (Alerts & Incidents group, after incident.io) and adds a Rootly card to the alerts destination cards snippet used on the alerts overview page.

Notes

• Screenshots are solid-color placeholder images (docs/pics/cloud/rootly_*.png) so the page passes the mintlify-validate broken-links check. Each <Frame> has a {/* TODO: screenshot ... */} comment marking what real screenshot needs to be captured and dropped in.

Test plan

• mintlify broken-links passes with no broken links
• mintlify dev — new page loads (200) with no new console errors
• Replace placeholder images with real screenshots of the Rootly and Elementary UI

Made with Cursor

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