Cross link between cluster topics

doc/user/clusters/applications.md

 # GitLab Managed Apps
 
 GitLab provides **GitLab Managed Apps**, a one-click install for various applications which can
-be added directly to your configured cluster. These applications are
-needed for [Review Apps](../../ci/review_apps/index.md) and
-[deployments](../../ci/environments.md) when using [Auto DevOps](../../topics/autodevops/index.md).
+be added directly to your configured cluster.
+
+These applications are needed for [Review Apps](../../ci/review_apps/index.md)
+and [deployments](../../ci/environments.md) when using [Auto DevOps](../../topics/autodevops/index.md).
+
 You can install them after you
-[create a cluster](../project/clusters/index.md#add-new-gke-cluster).
+[create a cluster](../project/clusters/index.md#adding-and-removing-clusters).
 
 ## Installing applications
 
@@ -20,8 +22,10 @@ This namespace:
 To see a list of available applications to install:
 
 1. For a:
-   - Project-level cluster, navigate to your project's **Operations > Kubernetes**.
-   - Group-level cluster, navigate to your group's **Kubernetes** page.
+   - [Project-level cluster](../project/clusters/index.md),
+     navigate to your project's **Operations > Kubernetes**.
+   - [Group-level cluster](../group/clusters/index.md),
+     navigate to your group's **Kubernetes** page.
 
 Install Helm first as it's used to install other applications.
 
@@ -160,9 +164,9 @@ file.
 When installing JupyterHub onto your Kubernetes cluster, [JupyterLab's Git extension](https://github.com/jupyterlab/jupyterlab-git)
 is automatically provisioned and configured using the authenticated user's:
 
-- Name
-- Email
-- Newly created access token
+- Name.
+- Email.
+- Newly created access token.
 
 JupyterLab's Git extension enables full version control of your notebooks as well as issuance of Git commands within Jupyter.
 Git commands can be issued via the **Git** tab on the left panel or via Jupyter's command line prompt.
@@ -233,8 +237,10 @@ The applications below can be upgraded.
 To upgrade an application:
 
 1. For a:
-   - Project-level cluster, navigate to your project's **Operations > Kubernetes**.
-   - Group-level cluster, navigate to your group's **Kubernetes** page.
+   - [Project-level cluster](../project/clusters/index.md),
+     navigate to your project's **Operations > Kubernetes**.
+   - [Group-level cluster](../group/clusters/index.md),
+     navigate to your group's **Kubernetes** page.
 1. Select your cluster.
 1. If an upgrade is available, the **Upgrade** button is displayed. Click the button to upgrade.
 
@@ -263,8 +269,10 @@ The applications below can be uninstalled.
 To uninstall an application:
 
 1. For a:
-   - Project-level cluster, navigate to your project's **Operations > Kubernetes**.
-   - Group-level cluster, navigate to your group's **Kubernetes** page.
+   - [Project-level cluster](../project/clusters/index.md),
+     navigate to your project's **Operations > Kubernetes**.
+   - [Group-level cluster](../group/clusters/index.md),
+     navigate to your group's **Kubernetes** page.
 1. Select your cluster.
 1. Click the **Uninstall** button for the application.