docs: document analytics module (#12563)

www/apps/book/app/learn/fundamentals/modules/infrastructure-modules/page.mdx

@@ -20,6 +20,7 @@ There are different Infrastructure Module types including:
 
 ![Diagram illustrating how the modules connect to third-party services](https://res.cloudinary.com/dza7lstvk/image/upload/v1727095814/Medusa%20Book/architectural-modules_bj9bb9.jpg)
 
+- Analytics Module: Integrates a third-party service to track and analyze user interactions and system events.
 - Cache Module: Defines the caching mechanism or logic to cache computational results.
 - Event Module: Integrates a pub/sub service to handle subscribing to and emitting events.
 - Workflow Engine Module: Integrates a service to store and track workflow executions and steps.

www/apps/book/app/learn/introduction/architecture/page.mdx

@@ -71,6 +71,7 @@ You can replace any of the third-party services mentioned above to build your pr
 
 [Infrastructure Modules](!resources!/infrastructure-modules) integrate third-party services and systems that customize Medusa's infrastructure. Medusa has the following Infrastructure Modules:
 
+- [Analytics Module](!resources!/infrastructure-modules/analytics): Tracks and analyzes user interactions and system events with third-party analytic providers. You can integrate [PostHog](!resources!/infrastructure-modules/analytics/posthog) as the analytics provider.
 - [Cache Module](!resources!/infrastructure-modules/cache): Caches data that require heavy computation. You can integrate a custom module to handle the caching with services like Memcached, or use the existing [Redis Cache Module](!resources!/infrastructure-modules/cache/redis).
 - [Event Module](!resources!/infrastructure-modules/event): A pub/sub system that allows you to subscribe to events and trigger them. You can integrate [Redis](!resources!/infrastructure-modules/event/redis) as the pub/sub system.
 - [File Module](!resources!/infrastructure-modules/file): Manages file uploads and storage, such as upload of product images. You can integrate [AWS S3](!resources!/infrastructure-modules/file/s3) for file storage.

www/apps/book/generated/edit-dates.mjs

@@ -89,8 +89,8 @@ export const generatedEditDates = {
   "app/learn/customization/integrate-systems/schedule-task/page.mdx": "2025-01-28T16:42:42.071Z",
   "app/learn/customization/integrate-systems/service/page.mdx": "2024-12-09T11:02:39.594Z",
   "app/learn/customization/next-steps/page.mdx": "2025-04-17T08:50:17.036Z",
-  "app/learn/fundamentals/modules/infrastructure-modules/page.mdx": "2025-05-05T07:54:33.931Z",
-  "app/learn/introduction/architecture/page.mdx": "2025-04-17T08:51:32.723Z",
+  "app/learn/fundamentals/modules/infrastructure-modules/page.mdx": "2025-05-21T14:31:51.644Z",
+  "app/learn/introduction/architecture/page.mdx": "2025-05-21T14:31:51.644Z",
   "app/learn/fundamentals/data-models/infer-type/page.mdx": "2025-03-18T07:41:01.936Z",
   "app/learn/fundamentals/custom-cli-scripts/seed-data/page.mdx": "2024-12-09T14:38:06.385Z",
   "app/learn/fundamentals/environment-variables/page.mdx": "2025-03-11T08:55:03.343Z",

www/apps/book/scripts/prepare.mjs

@@ -69,6 +69,15 @@ async function main() {
           /^(?!.*\/(workflows|js-sdk|extend|admin-widget-zones)\/).*$/,
         ],
       },
+      {
+        dir: path.join(
+          process.cwd(),
+          "..",
+          "resources",
+          "app",
+          "infrastructure-modules"
+        ),
+      },
       {
         dir: path.join(
           process.cwd(),
@@ -192,17 +201,6 @@ async function main() {
           },
         },
       },
-      {
-        dir: path.join(
-          process.cwd(),
-          "..",
-          "resources",
-          "references",
-          "medusa_config",
-          "interfaces",
-          "medusa_config.ConfigModule"
-        ),
-      },
       {
         dir: path.join(
           process.cwd(),