[SRVCOM-1846]: Remove outdated module and add content to func getting started

Author: abrennan89

modules/serverless-build-func-kn.adoc

@@ -6,30 +6,16 @@
 [id="serverless-build-func-kn_{context}"]
 = Building functions
 
-Before you can run a function, you must build the function project by using the `kn func build` command. The build command reads the `func.yaml` file from the function project directory to determine the image name and registry.
+Before you can run a function, you must build the function project by using the `kn func build` command. This command creates an OCI container image that can be run locally on your computer or on an {product-title} cluster. The build command uses the function project name and the image registry name to construct a fully qualified image name for your function.
 
-.Example `func.yaml`
-[source,yaml]
-----
-name: example-function
-namespace: default
-runtime: node
-image: <image_from_registry>
-imageDigest: ""
-trigger: http
-builder: default
-builderMap:
-  default: quay.io/boson/faas-nodejs-builder
-envs: {}
-----
+The OpenShift Container Registry is used by default as the image registry for storing function images. You can override this by using the `-r` flag:
 
-If the image name and registry are not set in the `func.yaml` file, you must either specify the registry flag, `-r` when using the `kn func build` command, or you are prompted to provide a registry value in the terminal when building a function. An image name is then derived from the registry value that you have provided.
-
-.Example command using the `-r` registry flag
+.Example build command
 [source,terminal]
 ----
-$ kn func build [-i <image> -r <registry> -p <path>]
+$ kn func build -r quay.io/username
 ----
+// removed mentioning the `FUNC_REGISTRY` environment variable because we didn't provide an example and it seems unnecessary - can add it in later if it's important
 
 .Example output
 [source,terminal]
@@ -38,17 +24,10 @@ Building function image
 Function image has been built, image: quay.io/username/example-function:latest
 ----
 
-This command creates an OCI container image that can be run locally on your computer, or on a Kubernetes cluster.
+To learn more about `kn func build` command options, you can use the help command:
 
-.Example using the registy prompt
+.Build help command
 [source,terminal]
 ----
-$ kn func build
-A registry for function images is required (e.g. 'quay.io/boson').
-
-Registry for function images: quay.io/username
-Building function image
-Function image has been built, image: quay.io/username/example-function:latest
+$ kn func help build
 ----
-
-The values for image and registry are persisted to the `func.yaml` file, so that subsequent invocations do not require the user to specify these again.

modules/serverless-deploy-func-kn.adoc

@@ -6,14 +6,12 @@
 [id="serverless-deploy-func-kn_{context}"]
 = Deploying functions
 
-You can deploy a function to your cluster as a Knative service by using the `kn func deploy` command.
-
-If the targeted function is already deployed, it is updated with a new container image that is pushed to a container image registry, and the Knative service is updated.
+You can deploy a function to your cluster as a Knative service by using the `kn func deploy` command. If the targeted function is already deployed, it is updated with a new container image that is pushed to a container image registry, and the Knative service is updated.
 
 .Prerequisites
 
 * The {ServerlessOperatorName} and Knative Serving are installed on the cluster.
-* You have installed the `kn` CLI.
+* You have installed the Knative (`kn`) CLI.
 * You have created a project or have access to a project with the appropriate roles and permissions to create applications and other workloads in {product-title}.
 * You must have already created and initialized the function that you want to deploy.
 
@@ -23,7 +21,7 @@ If the targeted function is already deployed, it is updated with a new container
 +
 [source,terminal]
 ----
-$ kn func deploy [-n <namespace> -p <path> -i <image> -r <registry>]
+$ kn func deploy [-n <namespace> -p <path> -i <image>]
 ----
 +
 .Example output

modules/serverless-functions-using-integrated-registry.adoc

@@ -6,11 +6,11 @@ include::_attributes/common-attributes.adoc[]
 
 toc::[]
 
+This guide explains how you can get started with creating, building, and deploying a function on an {ServerlessProductName} installation. When building and deploying functions, the resulting container image is stored in an image registry.
+
 :FeatureName: {FunctionsProductName}
 include::snippets/technology-preview.adoc[leveloffset=+2]
 
-This guide explains how you can get started with creating, building, and deploying a function on an {ServerlessProductName} installation.
-
 [id="prerequisites_serverless-functions-getting-started"]
 == Prerequisites
 
@@ -20,7 +20,6 @@ include::modules/serverless-create-func-kn.adoc[leveloffset=+1]
 include::modules/serverless-build-func-kn.adoc[leveloffset=+1]
 include::modules/serverless-deploy-func-kn.adoc[leveloffset=+1]
 include::modules/serverless-kn-func-invoke.adoc[leveloffset=+1]
-include::modules/serverless-functions-using-integrated-registry.adoc[leveloffset=+1]
 
 ifdef::openshift-enterprise[]
 [id="additional-resources_serverless-functions-getting-started"]