Updated support contact URL (#29298)

- Updated the support contact URL to point to #help-dogfood instead of
the customer support portal.

Co-authored-by: Sam Pfluger <108141731+Sampfluger88@users.noreply.github.com>

it-and-security/default.yml

@@ -34,7 +34,7 @@ org_settings:
       - "📱🏢 Company-owned mobile devices"
       - "📱🔐 Personal mobile devices"
   org_info:
-    contact_url: https://fleetdm.com/company/contact
+    contact_url: https://fleetdm.slack.com/archives/C071NNMSP2R
     org_logo_url: ""
     org_logo_url_light_background: ""
     org_name: Fleet