PT-2534: Switch ChatOps docs to irbot /ir slash commands (hold until irbot deploy)

[hankwallace]

Hold until the new irbot service is deployed. Opened as a draft on purpose — mark ready and merge once /ir is live in Slack. Merging triggers the auto-deploy workflow, which rebuilds and publishes the site.

Switches the incident-response documentation from the legacy opsbot !ir message commands to the new irbot Slack slash commands.

Commands: !ir … → /ir …

Across all docs (call_etiquette, severity_levels, what_is_an_incident, during_an_incident, security_incident_response, chatops, internal_liaison):

Old	New
!ir	/ir
!ir page	/ir page
!ir page <user>	/ir page <user>
!ir page responders	/ir page responders
!ir responders	/ir responders
!ir who <user>	/ir who <target>

• /ir who <target> behavior updated to match irbot: if <target> is a team name it shows that team's on-call; otherwise it's treated as a Slack user search. (Command surface per irbot's README / manifest.yaml.)
• ChatOps intro reframed: incident-response commands are now Slack slash commands handled by our incident response bot — not !-prefixed messages "watched for" in-channel.

Removed the !status family (deferred)

The status bot is deferred for now, so all !status references are removed rather than left dangling: the ChatOps Status section, the scribe "status stalking" steps, the during-an-incident "status monitoring bot" step, and the orphaned status.png / status_stalk.png screenshots.

Favicon fix

The browser-tab icon was still PagerDuty's (bundled in the theme). Added the Elimu Informatics favicon (reused from engage-web) at theme_overrides/assets/images/favicon.png, which overrides the theme's assets/images/favicon.png via theme.custom_dir.

Notes

• The ir_*.png ChatOps screenshots are unchanged here — they'll be recaptured against the live irbot UI (separately).
• mkdocs build --clean passes; built site has 0 !ir and 0 !status references, the favicon is overridden, and the #ir-page anchor (linked from the training course) still resolves.

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