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/user/user-creation-flows/page.mdx

@@ -25,7 +25,7 @@ await userModuleService.updateInvites({
   accepted: true,
 })
 
-const user = await userModuleService.create({
+const user = await userModuleService.createUsers({
   email: invite.email,
 })
 ```
@@ -45,7 +45,7 @@ await userModuleService.refreshInviteTokens(["invite_123"])
 Finally, you can create a user using the [create method of the User Module’s main service](/references/user/create):
 
 ```ts
-const user = await userModuleService.create({
+const user = await userModuleService.createUsers({
   email: "user@example.com",
 })
 ```
@@ -63,12 +63,12 @@ const { success, authIdentity } =
   })
 
 // assuming authIdentity is defined
-const [, count] = await userModuleService.listAndCount({
+const [, count] = await userModuleService.listAndCountUsers({
   email: authIdentity.entity_id,
 })
 
 if (!count) {
-  const user = await userModuleService.create({
+  const user = await userModuleService.createUsers({
     email: authIdentity.entity_id,
   })
 }