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/pricing/price-calculation/page.mdx

@@ -178,7 +178,7 @@ const ruleTypes = await pricingModuleService.createRuleTypes([
   },
 ])
 
-const priceSet = await pricingModuleService.create({
+const priceSet = await pricingModuleService.createPriceSets({
   rules: [
     { rule_attribute: "region_id" },
     { rule_attribute: "city" },
@@ -422,7 +422,7 @@ const priceSet = await pricingModuleService.create({
     <TabsContent value="code">
 
     ```ts
-    const priceList = pricingModuleService.createPriceList({
+    const priceList = pricingModuleService.createPriceLists({
       name: "Test Price List",
       starts_at: Date.parse("01/10/2023"),
       ends_at: Date.parse("31/10/2023"),