docs: update aws and gcp self-managed page with terraform instructions (#30846)

Author: kay-kim

doc/user/content/self-managed/_index.md

@@ -19,11 +19,7 @@ Kubernetes environment. For self-managed Materialize, Materialize offers:
 
 The self-managed Materialize requires the following:
 
-- Kubernetes (v1.19+) environment.
-
-- PostgreSQL or CockroachDB as a metadata database.
-
-- Blob storage.
+{{% self-managed/requirements-list %}}
 
 See the [Installation guide](/self-managed/installation/) for more information.
 

doc/user/content/self-managed/installation/_index.md

@@ -5,16 +5,30 @@ robots: "noindex, nofollow"
 disable_list: true
 ---
 
-## Install locally
+You can install self-managed Materialize on a Kubernetes cluster running locally
+or on a cloud provider.
 
-- [Install locally on kind](/self-managed/installation/install-on-local-kind/)
+## Install locally
 
-- [Install locally on minikube](/self-managed/installation/install-on-local-minikube/)
+{{< multilinkbox >}}
+{{< linkbox title="Using Docker/kind" >}}
+[Install locally on kind](/self-managed/installation/install-on-local-kind/)
+{{</ linkbox >}}
+{{< linkbox  title="Using Docker/minikube" >}}
+[Install locally on minikube](/self-managed/installation/install-on-local-minikube/)
+{{</ linkbox >}}
+{{</ multilinkbox >}}
 
 ## Install on cloud provider
 
-- [Install on AWS](/self-managed/installation/install-on-aws/)
-- [Install on GCP](/self-managed/installation/install-on-gcp/)
+{{< multilinkbox >}}
+{{< linkbox title="AWS" >}}
+[Install on AWS](/self-managed/installation/install-on-aws/)
+{{</ linkbox >}}
+{{< linkbox title="GCP" >}}
+[Install on GCP](/self-managed/installation/install-on-gcp/)
+{{</ linkbox >}}
+{{</ multilinkbox >}}
 
 ## See also