Link to installation docs from other guides

docs/guides/helmreleases.md

@@ -12,7 +12,7 @@ The helm-controller is part of the default toolkit installation.
 To follow this guide you'll need a Kubernetes cluster with the GitOps 
 toolkit controllers installed on it.
 Please see the [get started guide](../get-started/index.md)
-or the [install command docs](../cmd/tk_install.md).
+or the [installation guide](installation.md).
 
 ## Define a Helm repository
 

docs/guides/notifications.md

@@ -8,7 +8,10 @@ of an app was deployed and if the deployment is healthy.
 
 ## Prerequisites
 
-* [Get started guide](../get-started/index.md)
+To follow this guide you'll need a Kubernetes cluster with the GitOps 
+toolkit controllers installed on it.
+Please see the [get started guide](../get-started/index.md)
+or the [installation guide](installation.md).
 
 The GitOps toolkit controllers emit Kubernetes events whenever a resource status changes.
 You can use the [notification-controller](../components/notification/controller.md)

docs/guides/sealed-secrets.md

@@ -11,7 +11,7 @@ nobody else can obtain the original secret, even if they have access to the Git
 To follow this guide you'll need a Kubernetes cluster with the GitOps 
 toolkit controllers installed on it.
 Please see the [get started guide](../get-started/index.md)
-or the [install command docs](../cmd/tk_install.md).
+or the [installation guide](installation.md).
 
 The sealed-secrets controller comes with a companion CLI tool called kubeseal.
 With kubeseal you can create SealedSecret custom resources in YAML format

docs/guides/webhook-receivers.md

@@ -11,7 +11,7 @@ GitOps pipelines that react to external events.
 To follow this guide you'll need a Kubernetes cluster with the GitOps 
 toolkit controllers installed on it.
 Please see the [get started guide](../get-started/index.md)
-or the [install command docs](../cmd/tk_install.md).
+or the [installation guide](installation.md).
 
 The [notification controller](../components/notification/controller.md)
 can handle events coming from external systems