double auth procy marked obsolete

Author: stefan-wenig

docs/trusted-build-systems/double-authentication-proxy.md

@@ -6,6 +6,11 @@ show_toc: 3
 description: Double Authentication Proxy
 ---
 
+{:.panel.warning}
+> **Obsolete**
+>
+> The Double Authentication Proxy connector is scheduled for retirement. Please let us know if you need it for any scenarios currently not covered by other connectors.
+
 The Double Authentication Proxy is a connector that will let you use mutual TLS (TLS/SSL client certificates) for build node authentication. 
 
 This results in a two-fold authentication strategy:

docs/trusted-build-systems/index.md

@@ -62,6 +62,4 @@ Possible policies include:
 * Prevent root access: allow code signing only from build agents that don't allow any build scripts to modify systems settings
 * Prevent network access: guarantee that artifacts cannot be arbitrarily received from internet sources
 * Restrict user access: don't let development teams connect to the build agent, with or without administrative permissions (if you need build nodes with wider permission sets, consider separating the process of compilation and packaging from other steps such as running tests)
-* Require current security policies: avoid misuse of recently restored or otherwise not up-to-date build agents
-
-See the [Double Authentication Proxy](/trusted-build-systems/double-authentication-proxy) for a simple way to achieve this using machine certificate enrollment. 
+* Require current security policies: avoid misuse of recently restored or otherwise not up-to-date build agents