chore(docs): update README

README.md

@@ -1,30 +1,2 @@
-Spinnaker Gateway Service
-------------------------------------
-[![Build Status](https://api.travis-ci.org/spinnaker/gate.svg?branch=master)](https://travis-ci.org/spinnaker/gate)
-
-This service provides the Spinnaker REST API, servicing scripting clients as well as all actions from [Deck](https://github.com/spinnaker/deck).
-The REST API fronts the following services:
-* [CloudDriver](https://github.com/spinnaker/clouddriver)
-* [Front50](https://github.com/spinnaker/front50)
-* [Igor](https://github.com/spinnaker/igor)
-* [Orca](https://github.com/spinnaker/orca)
-
-### Modular builds
-By default, Gate is built with all authentication providers included. To build only a subset of
-providers, use the `includeProviders` flag:
- ```
-./gradlew -PincludeProviders=oauth2,x509 clean build
-```
- You can view the list of all providers in `gradle.properties`.
-
-### Debugging
-
-To start the JVM in debug mode, set the Java system property `DEBUG=true`:
-
-```
-./gradlew -DDEBUG=true
-```
-
-The JVM will then listen for a debugger to be attached on port 8184.  The JVM will _not_ wait for
-the debugger to be attached before starting Gate; the relevant JVM arguments can be seen and
-modified as needed in `build.gradle`.
+> [!IMPORTANT]  
+> Gate is now maintained in the [Spinnaker monorepo](https://github.com/spinnaker/spinnaker). This repository has been archived.