add deprecation warning

Author: sabban

crowdsec-docs/unversioned/bouncers/haproxy.mdx

@@ -26,6 +26,14 @@ import RemediationSupportBadges from '@site/src/components/remediation-support-b
   Appsec={false}
 />
 
+:::danger
+
+This bouncer isn't actively supported anymore.
+
+We strongly suggest, you use the [Haproxy SPOA Bouncer](/u/bouncers/haproxy_spoa).
+
+:::
+
 
 A lua Remediation Component for haproxy.