[chore] Update naming of google tag gateway, allow the robots (#22167)

Update the screenshots

Author: jonnyparris

public/__redirects

@@ -675,6 +675,9 @@
 /gateway/locations/setup-instructions/android/ /cloudflare-one/connections/connect-devices/agentless/dns/locations/ 301
 /gateway/locations/setup-instructions/router/ /cloudflare-one/policies/gateway/dns-policies/ 301
 
+# google tag
+/google-tag-first-party-mode/ /google-tag-gateway/ 301
+
 # images
 /images/cloudflare-images/upload-images/supported-formats/ /images/upload-images/ 301
 /image-resizing/ /images/manage-images/create-variants/ 301

public/robots.txt

@@ -4,7 +4,6 @@ Disallow: /client-ip-geolocation
 Disallow: /plans/
 Disallow: /constellation
 Disallow: /cdn-cgi/
-Disallow: /google-tag-first-party-mode/
 Disallow: /security/
 Disallow: /email-security/
 

src/assets/images/google-tag-first-party-mode/google-tag-configuration.png

@@ -0,0 +1,29 @@
+---
+title: Google tag gateway for advertisers
+pcx_content_type: reference
+sidebar:
+  order: 1
+
+---
+
+## Get started
+
+Google tag gateway for advertisers allows website owners using Cloudflare as a CDN to get the most out of ad measurement tools with just a few clicks.
+
+### Configure Google tag gateway for advertisers in the dashboard
+
+1. Log in to the [Cloudflare dashboard](https://dash.cloudflare.com/login) and select your account.
+2. Go to **Tag Management** > **Google tag gateway**.
+3. Select your domain.
+4. Enable the toggle for **Turn on and configure Google tag gateway**.
+
+![Google tag gateway for advertisers configuration](~/assets/images/google-tag-gateway/google-tag-configuration.png)
+
+5. Add your Google tag ID and the path on your website reserved for the Google tag.
+The [Google tag ID](https://support.google.com/analytics/answer/9539598?hl=en) can be found in the Google Tag Experience dashboard. The measurement path is an unused path on your site that will load Google Tag Manager and all subsequent measurement requests.
+
+![Add to ID and path](~/assets/images/google-tag-gateway/google-tag-id-path.png)
+
+6. Once you click **Save**, Google tag gateway for advertisers will be enabled on your zone. If you already have a GTM script on your website, this First Party Tag will override the existing script.
+
+Now that you have authenticated into your Cloudflare account and configured GTM in first-party mode, your Google Tags will be loaded using `https://your-domain/measurement-path/...`and subsequent measurement requests will be served by Cloudflare.

src/assets/images/google-tag-first-party-mode/google-tag-id-path.png

@@ -0,0 +1,11 @@
+name: Google tag gateway for advertisers
+
+product:
+  title: Google tag gateway for advertisers
+  url: /google-tag-gateway/
+  group: Application performance
+
+meta:
+  title: Google tag gateway for advertisers docs
+  description: Google tag gateway for advertisers allows website owners using Google Tag Manager and Cloudflare as a CDN to add a layer of data security and enables additional data privacy controls.
+  author: "@cloudflare"