docs: update the documentation on how to skip deploying an app

Fix up the documentation to reference how the appsets have mutated on
how to skip an application from being deployed.

Author: cardoe

docs/deploy-guide/add-remove-app.md

@@ -23,14 +23,16 @@ in your deployment repo.
 
 ## Removing an application for a specific deploy
 
-To remove an application from being deployed, add or modify the `uc_skip_components`
-annotation on the Kubernetes Secret which defines the cluster in the `argocd` namespace.
-The `uc_skip_components` annotation is a string-ified JSON list of applications to
-skip like:
+To remove an application from being deployed, create an `apps.yaml` file in your deployment
+repo at `$DEPLOY_NAME/apps.yaml`). The `apps.yaml` file
+contains a list of objects, where each object has a `component` field that is the name
+of the component (app) and an optional `skip` field that can be set to `true`:
 
 ```yaml
-uc_skip_components: |
-  ["metallb"]
+- component: metallb
+  skip: true
+- component: dex
+  skip: false  # optional, defaults to false
 ```
 
 ## Adding an application to UnderStack

docs/deploy-guide/management-cluster.md

@@ -94,10 +94,6 @@ different configurations.
 : Git reference to use of the deploy repo. Can only be set for `dev` env
   clusters.
 
-`uc_skip_components`
-: string-ified JSON list of components or services from UnderStack to not
-  install in this cluster.
-
 ### Deploying your Cluster Config
 
 Once you have the Kubernetes secret which defines your cluster config ready