Add Slack integration and nudges logs to audit-logs.mdx (#271)

Added new activity logs for 
- Installing Slack integration
- Uninstalling Slack integration
- Configuring nudge
- Executing nudge
- User receiving nudge

Signed-off-by: tzhuo <33873864+tzhuo@users.noreply.github.com>

documentation/pages/business/audit-logs.mdx

@@ -144,6 +144,11 @@ Note that a new key named `date_time_iso` will be added to the logs.
 | user_reinvited                                 | Resent an invite to %(email)s                          |
 | billing_admin_added                            | Made %(name)s the billing contact                      |
 | billing_admin_removed                          | Revoked %(name)s as the billing contact                |
+| nitro_integration_app_installed                | Installed %(integration_app)s integration              |
+| nitro_integration_app_uninstalled              | Uninstalled %(integration_app)s integration            |
+| nudge_configured                               | Set %(nudge_name)s to %(status)s                       |
+| nudge_executed                                 | Nudged %(successes)s users for %(nudge_name)s          |
+| user_received_nudge                            | Received %(nudge_received)s nudge                      |
 
 ### Sensitive types