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/sales-channel/page.mdx

@@ -27,14 +27,15 @@ Some use case examples for using a sales channel:
 Manage sales channels in your store. Each sales channel has different meta information such as name or description, allowing you to easily differentiate between sales channels.
 
 ```ts
-const salesChannels = await salesChannelModuleService.create([
-  {
-    name: "B2B",
-  },
-  {
-    name: "Mobile App",
-  },
-])
+const salesChannels = await salesChannelModuleService
+  .createSalesChannels([
+    {
+     name: "B2B",
+    },
+    {
+     name: "Mobile App",
+    },
+  ])
 ```
 
 ### Product Availability
@@ -73,7 +74,8 @@ For example:
       request.scope.resolve(ModuleRegistrationName.SALES_CHANNEL)
 
     res.json({
-      sales_channels: await salesChannelModuleService.list(),
+      sales_channels: await salesChannelModuleService
+        .listSalesChannels(),
     })
   }
   ```
@@ -92,7 +94,8 @@ For example:
     const salesChannelModuleService: ISalesChannelModuleService =
       container.resolve(ModuleRegistrationName.SALES_CHANNEL)
 
-    const salesChannels = await salesChannelModuleService.list()
+    const salesChannels = await salesChannelModuleService
+      .listSalesChannels()
   }
   ```
 
@@ -112,7 +115,8 @@ For example:
         ModuleRegistrationName.SALES_CHANNEL
       )
     
-    const salesChannels = await salesChannelModuleService.list()
+    const salesChannels = await salesChannelModuleService
+      .listSalesChannels()
   })
   ```