Chef doc changes to add in-app section under installation section (#958)

* Chef doc changes to add in-app section under installation section

* Update README.md

Co-authored-by: Ida Adjivon <[email protected]>

---------

Co-authored-by: levan-m <[email protected]>

Author: iadjivon

README.md

@@ -50,40 +50,38 @@ The following Opscode cookbooks are dependencies:
 
 ### Installation
 
-1. Add the cookbook to your Chef server with [Berkshelf][5] or [Knife][6]:
-    ```text
+To install the Datadog Agent with Chef, follow the [in-app flow in Fleet Automation][18] setup guide for Berkshelf or Knife. This setup guide allows you to select observability features, and generates the necessary attributes and commands for your environment.
+
+These setup steps are also listed below:
+
+```text
     # Berksfile
     cookbook 'datadog', '~> 4.0'
     ```
-
     ```shell
     # Knife
     knife cookbook site install datadog
     ```
-
 2. Set the [Datadog-specific attributes](#datadog-attributes) in a role, environment, or another recipe:
     ```text
     node.default['datadog']['api_key'] = "<YOUR_DD_API_KEY>"
-
     node.default['datadog']['application_key'] = "<YOUR_DD_APP_KEY>"
     ```
-
 3. Upload the updated cookbook to your Chef server:
     ```shell
     berks upload
     # or
     knife cookbook upload datadog
     ```
-
 4. After uploading, add the cookbook to your node's `run_list` or `role`:
     ```text
     "run_list": [
       "recipe[datadog::dd-agent]"
     ]
     ```
-
 5. Wait for the next scheduled `chef-client` run or trigger it manually.
 
+
 ### Datadog attributes
 
 The following methods are available for adding your [Datadog API and application keys][4]:
@@ -445,3 +443,4 @@ KITCHEN_LOCAL_YAML=kitchen.docker.yml bundle exec rake circle
 [15]: https://github.com/DataDog/chef-datadog/blob/master/recipes/ddtrace-ruby.rb
 [16]: https://github.com/DataDog/integrations-core
 [17]: https://github.com/DataDog/chef-datadog/blob/master/recipes/system-probe.rb
+[18]: https://app.datadoghq.com/fleet/install-agent/latest?platform=chef