docs: updates to use DML and other changes (#7834)

- Change existing data model guides and add new ones for DML
- Change module's docs around service factory + remove guides that are now necessary
- Hide/remove all mentions of module relationships, or label them as coming soon.
- Change all data model creation snippets to use DML
- use `property` instead of `field` when referring to a data model's properties.
- Fix all snippets in commerce module guides to use new method suffix (no more main model methods)
- Rework recipes, removing/hiding a lot of sections as a lot of recipes are incomplete with the current state of DML.


### Other changes

- Highlight fixes in some guides
- Remove feature flags guide
- Fix code block styles when there are no line numbers.

### Upcoming changes in other PRs

- Re-generate commerce module references (for the updates in the method names)
- Ensure that the data model references are generated correctly for models using DML.
- (probably at a very later point) revisit recipes

www/apps/resources/app/commerce-modules/promotion/page.mdx

@@ -17,7 +17,7 @@ A promotion discounts an amount or percentage of a cart's items, shipping method
 The Promotion Module allows you to store and manage promotions.
 
 ```ts
-const promotion = await promotionModuleService.create({
+const promotion = await promotionModuleService.createPromotions({
   code: "10%OFF",
   type: "standard",
   application_method: {
@@ -34,7 +34,7 @@ const promotion = await promotionModuleService.create({
 A promotion has rules that restricts when it's applied. For example, you can create a promotion that's only applied to VIP customers.
 
 ```ts
-const promotion = await promotionModuleService.create({
+const promotion = await promotionModuleService.createPromotions({
   code: "10%OFF",
   type: "standard",
   application_method: {
@@ -94,7 +94,7 @@ For example:
       request.scope.resolve(ModuleRegistrationName.PROMOTION)
 
     res.json({
-      promotions: await promotionModuleService.list(),
+      promotions: await promotionModuleService.listPromotions(),
     })
   }
   ```
@@ -113,7 +113,7 @@ For example:
     const promotionModuleService: IPromotionModuleService =
       container.resolve(ModuleRegistrationName.PROMOTION)
 
-    const promotions = await promotionModuleService.list()
+    const promotions = await promotionModuleService.listPromotions()
   }
   ```
 
@@ -131,7 +131,7 @@ For example:
     const promotionModuleService: IPromotionModuleService =
       container.resolve(ModuleRegistrationName.PROMOTION)
 
-    const promotions = await promotionModuleService.list()
+    const promotions = await promotionModuleService.listPromotions()
   })
   ```