Change ADOPTERS document to point gardener.cloud (gardener#5003)

ADOPTERS.md

@@ -1,49 +1 @@
-# Gardener Adopters
-
-This is a list of adopters of Gardener in __production environments__ that have
-publicly shared details of their usage.
-
-- [b’nerd](https://bnerd.com) uses Gardener as the core technology for
-its own managed Kubernetes as a Service solution and operates multiple
-Gardener installations for several cloud hosting service providers.
-- [SAP](https://www.sap.com) uses Gardener to deploy and manage Kubernetes
-clusters at scale in a uniform way across infrastructures (AWS, Azure, GCP,
-Alicloud, OpenStack). Workloads include databases
-([SAP Hana](https://www.sap.com/products/hana.html)),
-Big Data ([SAP Data Hub](https://www.sap.com/products/data-hub.html)), IoT, AI,
-and Machine Learning ([SAP Leonardo](https://www.sap.com/products/leonardo.html)),
-Serverless and diverse business workloads.
-- [ScaleUp Technologies](https://www.scaleuptech.com/) runs Gardener
-within their public Openstack Clouds (Hamburg, Berlin, Düsseldorf).
-Their clients run all kinds of workloads on top of Gardener maintained
-Kubernetes clusters ranging from databases to Software as a Service
-applications.
-
-Cloud provider adopters
-
-- [Packet](https://packet.com) drove and sponsored integration of Gardener into its
-bare-metal cloud platform. Packet customers now are able to manage multiple Kubernetes
-clusters with ease everywhere that Packet is available: across regions, at the edge
-in telco networks, and on customer premises.
-
-Adopters in evaluation or pre-production phase
-
-- [Finanz Informatik Technologie Services GmbH]( https://f-i-ts.de/ )
-uses Gardener to offer k8s as a service for customers in the financial
-industry in Germany. It is built on top of a "metal as a service"
-infrastructure implemented from scratch for k8s workloads in mind.
-The result is k8s on top of bare metal in minutes.
-- [PTC](https://www.ptc.com) uses Gardener to provide development environments
-and CI/CD systems internally.
-- [Beez Innovation Labs Pvt Ltd](https://www.beezlabs.com/) uses Gardener to offer its 
-products across cloud providers and manage its clusters for different environments.
-- [PingCAP](https://pingcap.com/) uses Gardener to build its managed database service known as [TiDB Cloud](https://pingcap.com/tidb-cloud/) on mainstream cloud providers.
-
-Service provider adopters
-
-- [23 Technologies](https://23technologies.cloud/) uses Gardener to offer
-an enterprise-class Kubernetes engine for industrial use cases as well as
-cloud service providers and offers managed and professional services for it.
-
-If you’re using Gardener and aren’t on this list, feel free to
-[submit a pull request](https://github.com/gardener/gardener/pulls)!
+Please refer to the [Gardener adopters page](https://gardener.cloud/adopter/).