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/cart/examples/page.mdx

@@ -25,7 +25,7 @@ In this guide, you’ll find common examples of how you can use the Cart Module
     const cartModuleService: ICartModuleService =
       req.scope.resolve(ModuleRegistrationName.CART)
 
-    const cart = await cartModuleService.create({
+    const cart = await cartModuleService.createCarts({
       currency_code: "usd",
       shipping_address: {
         address_1: "1512 Barataria Blvd",
@@ -57,7 +57,7 @@ In this guide, you’ll find common examples of how you can use the Cart Module
   export async function POST(request: Request) {
     const cartModuleService = await initializeCartModule()
 
-    const cart = await cartModuleService.create({
+    const cart = await cartModuleService.createCarts({
       currency_code: "usd",
       shipping_address: {
         address_1: "1512 Barataria Blvd",
@@ -100,7 +100,9 @@ In this guide, you’ll find common examples of how you can use the Cart Module
     const cartModuleService: ICartModuleService =
       req.scope.resolve(ModuleRegistrationName.CART)
 
-    const cart = await cartModuleService.retrieve("cart_123")
+    const cart = await cartModuleService.retrieveCart(
+      "cart_123"
+    )
 
     res.json({ cart })
   }
@@ -119,7 +121,9 @@ In this guide, you’ll find common examples of how you can use the Cart Module
   export async function GET(request: Request) {
     const cartModuleService = await initializeCartModule()
 
-    const cart = await cartModuleService.retrieve("cart_123")
+    const cart = await cartModuleService.retrieveCart(
+      "cart_123"
+    )
 
     return NextResponse.json({
       cart,