Add basic drift detection install content (#2147)

* Add basic drift detection install content

* fix edit this page link

Author: ZachGoldberg

docs/2.0/docs/pipelines/configuration/driftdetection.md

@@ -1,8 +1,6 @@
 
 # Setting up Pipelines Drift Detection
 
-This page is under construction
-<!--
-## Already installed from infra-root boilerplate
-## Installing from scratch by adding the workflow file
--->
+If you're a Pipelines Enterprise customer and you installed Pipelines using our infrastructure-live-root repository template then Drift Detection is already installed and available as a GitHub workflow in your repository.
+
+If you installed Pipelines in a manner other than from the template and you're an enterprise customer and you want to add Drift Detection, see the [Installing Drift Detection Guide](../guides/installing-drift-detection.md).

docs/2.0/docs/pipelines/guides/installing-drift-detection.md

@@ -10,13 +10,13 @@ If you're creating new pipelines repositories using the latest version of Pipeli
 
 If you want to upgrade an older repository to add Drift Detection perform the following steps:
 
-### Step 1
+### Step 1 - Ensure the GitHub App is Installed
 
 Ensure you are using the [GitHub App](/2.0/docs/pipelines/installation/viagithubapp) in this repository. Drift Detection requires permissions from the GitHub App and is not available via machine user tokens.
 
 <PersistentCheckbox id="install-drift-1" label="GitHub App In Use" />
 
-### Step 2
+### Step 2 - Setup the Workflow file
 
 Create a new workflow file in your repository at `.github/workflows/pipelines-drift-detection.yml`
 
@@ -55,6 +55,6 @@ Commit the changes to the repository. If you are using [branch protection](/2.0/
 
 <PersistentCheckbox id="install-drift-2" label="Workflow File Created" />
 
-### Step 3
+### Step 3 - Run your first drift detection job
 
 Follow the instructions at [Running Drift Detection](/2.0/docs/pipelines/guides/running-drift-detection) to start using the new workflow.

docusaurus.config.js

@@ -87,7 +87,7 @@ const config = {
         docs: {
           routeBasePath: "/",
           sidebarPath: require.resolve("./sidebars.js"),
-          editUrl: "https://github.com/gruntwork-io/docs/edit/master/",
+          editUrl: "https://github.com/gruntwork-io/docs/edit/main/",
           exclude: [
             "guides/build-it-yourself/landing-zone/**",
             "guides/build-it-yourself/vpc/**",