refactor(crons): add SentryCron decorator documentation (#15682)

## DESCRIBE YOUR PR

Moved the SentryCron decorator details to a new include file for better
organization. Updated the main guide to reference this new include,
ensuring clarity and maintainability of the documentation.

Co-authored-by: Paul Jaffre <jaffrepaul@gmail.com>

Author: gaprl

docs/platforms/javascript/guides/nestjs/features/sentry-cron-decorator.mdx

@@ -3,36 +3,4 @@ title: SentryCron Decorator
 description: "Learn about Sentry's SentryCron decorator."
 ---
 
-<Alert>
-  The `@SentryCron` decorator is available from version `@sentry/nestjs` 8.16.0 and up.
-</Alert>
-
-The NestJS SDK includes a `@SentryCron` decorator that can be used to augment the native NestJS `@Cron` decorator to
-send check-ins to Sentry before and after each cron job run.
-
-To get started, import `SentryCron` from `@sentry/nestjs` and use it to decorate a cron job function in your NestJS application.
-
-<Alert>
-  The `@SentryCron` decorator needs to be applied after the `@Cron` decorator, or else the instrumentation does not work.
-</Alert>
-
-```typescript
-import { Cron } from '@nestjs/schedule';
-import { SentryCron } from '@sentry/nestjs';
-
-export class MyCronService {
-  @Cron('* * * * *')
-  @SentryCron('my-monitor-slug', {
-    schedule: {
-      type: "crontab",
-      value: "* * * * *",
-    },
-    checkinMargin: 2, // In minutes. Optional.
-    maxRuntime: 10, // In minutes. Optional.
-    timezone: "America/Los_Angeles", // Optional.
-  })
-  handleCron() {
-    // Your cron job logic here
-  }
-}
-```
+<Include name="nestjs-sentry-cron-decorator.mdx" />

includes/nestjs-sentry-cron-decorator.mdx

@@ -0,0 +1,33 @@
+<Alert>
+  The `@SentryCron` decorator is available from version `@sentry/nestjs` 8.16.0 and up.
+</Alert>
+
+The NestJS SDK includes a `@SentryCron` decorator that can be used to augment the native NestJS `@Cron` decorator to send check-ins to Sentry before and after each cron job run.
+
+To get started, import `SentryCron` from `@sentry/nestjs` and use it to decorate a cron job function in your NestJS application.
+
+<Alert>
+  The `@SentryCron` decorator needs to be applied after the `@Cron` decorator, or else the instrumentation does not work.
+</Alert>
+
+```typescript
+import { Cron } from '@nestjs/schedule';
+import { SentryCron } from '@sentry/nestjs';
+
+export class MyCronService {
+  @Cron('* * * * *')
+  @SentryCron('my-monitor-slug', {
+    schedule: {
+      type: "crontab",
+      value: "* * * * *",
+    },
+    checkinMargin: 2, // In minutes. Optional.
+    maxRuntime: 10, // In minutes. Optional.
+    timezone: "America/Los_Angeles", // Optional.
+  })
+  handleCron() {
+    // Your cron job logic here
+  }
+}
+```
+

platform-includes/crons/setup/javascript.nestjs.mdx

@@ -0,0 +1,19 @@
+## Automatic Crons Instrumentation (Recommended)
+
+### NestJS Decorator
+
+<Include name="nestjs-sentry-cron-decorator.mdx" />
+
+<Include name="javascript-crons-automatic-crons-instrumentation.mdx" />
+
+## Job Monitoring
+
+<Include name="javascript-crons-job-monitoring.mdx" />
+
+## Check-Ins
+
+<Include name="javascript-crons-checkins.mdx" />
+
+## Upserting Cron Monitors
+
+<Include name="javascript-crons-upsert.mdx" />