Adding incident management slack docs
💡 This MR was reverted and re-added in !104104 (merged) with parts of the doc commented out to only show available features.
What does this MR do and why?
Introducing a new docs page to hold all of the new incident management features for Slack.
Follows the page structure described in: #374994 (closed)
MR acceptance checklist
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Edited by Marcin Sedlak-Jakubowski