[release-0.24] Changes to nav, consolidate Getting Started README (#4025)

* Changes to nav, consolidate README

* delete unused file

* changing nav back

Co-authored-by: Omer B <obensaadon@vmware.com>

config/nav.yml

@@ -2,9 +2,8 @@ INHERIT: redirects.yml
 
 nav:
     - Home: index.md
-    - Getting Started:
-        - Before you begin: getting-started/README.md
-        - Knative Quickstart: getting-started/install-knative-quickstart.md
+    - Getting started:
+        - Knative Quickstart: getting-started/README.md
         - Using Knative Serving:
           - First Knative Service: getting-started/first-service.md
           - Scaling to Zero: getting-started/first-autoscale.md

docs/getting-started/README.md

@@ -1,13 +1,29 @@
-# Before you begin
+# Getting Started with Knative
+## Before you begin
 !!! warning
     Knative Quickstart Environments are for experimentation use only. For production installation, see our [Administrator's Guide](../admin)
 
 Before you can get started with a Knative Quickstart deployment you must install kind and the Kubernetes CLI.
 
-## Install Kind (Kubernetes in Docker)
+### Install Kind (Kubernetes in Docker)
 
 You can use [`kind`](https://kind.sigs.k8s.io/docs/user/quick-start){target=_blank} (Kubernetes in Docker) to run a local Kubernetes cluster with Docker container nodes.
 
-## Install the Kubernetes CLI
+### Install the Kubernetes CLI
 
 The [Kubernetes CLI (`kubectl`)](https://kubernetes.io/docs/tasks/tools/install-kubectl){target=_blank}, allows you to run commands against Kubernetes clusters. You can use `kubectl` to deploy applications, inspect and manage cluster resources, and view logs.
+
+
+## Install the Knative "Quickstart" environment
+
+You can get started with a local deployment of Knative by using _Knative on Kind_ (`konk`):
+
+--8<-- "quickstart-install.md"
+
+## Install the Knative CLI
+
+The Knative CLI (`kn`) provides a quick and easy interface for creating Knative resources, such as Knative Services and Event Sources, without the need to create or modify YAML files directly.
+
+`kn` also simplifies completion of otherwise complex procedures such as autoscaling and traffic splitting.
+
+--8<-- "install-kn.md"

docs/getting-started/install-knative-quickstart.md

@@ -1,15 +0,0 @@
-# Getting Started with the Knative "Quickstart" Environment
-
-## Install Knative using the konk script
-
-You can get started with a local deployment of Knative by using _Knative on Kind_ (`konk`):
-
---8<-- "quickstart-install.md"
-
-## Install the Knative CLI
-
-The Knative CLI (`kn`) provides a quick and easy interface for creating Knative resources, such as Knative Services and Event Sources, without the need to create or modify YAML files directly.
-
-`kn` also simplifies completion of otherwise complex procedures such as autoscaling and traffic splitting.
-
---8<-- "install-kn.md"