INA-7891: Extract off-topic sections from "Describe incident" documentation

[cperryk]

What does this PR do? What is the motivation?

This PR updates Incident Management documentation to extract content from the "Describe incident" page that has nothing to do with describing the incident.

Specifically, it:

• Moves content about declaring an incident to the "Declare incident" page.
• Moves content about managing a response team to a new "Response team" page.
• Strikes content related to notifications, which is already sufficiently covered by other pages.

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

✅ Documentation Team Review

The documentation team has approved this pull request. Thank you for your contribution!

[github-actions]

Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/christopher.kirk/update-describe-incident/service_management/incident_management/response_team

Modified Files

• https://docs-staging.datadoghq.com/christopher.kirk/update-describe-incident/service_management/incident_management/declare
• https://docs-staging.datadoghq.com/christopher.kirk/update-describe-incident/service_management/incident_management/describe

[domalessi]

Thanks, @cperryk ! Created DOCS-11749 for review.

[cperryk]

Thanks @domalessi — Just for my awareness, roughly how long should I expect that review to take? (No pressure, just wondering.) And is this elevated level of review due to the fact that I have created a new page?

[domalessi]

@cperryk The "elevated" review was just because I didn't have time to review myself during my on call session yesterday! It's a relatively small PR though, so I expect turnaround time should be within a few days. If you need this by a certain date, I can certainly flag that for my team. Let me know!

[cperryk]

@domalessi Ah, I see, thanks! Not needed by a certain date. Appreciate the help!

[estherk15]

Thanks for updating this @cperryk , left some formatting and link fixes. Let me know if you have questions. If this looks good, I can merge!

[cperryk]

@estherk15 Thanks, merge away!