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/book/app/advanced-development/data-models/searchable-property/page.mdx

@@ -0,0 +1,46 @@
+export const metadata = {
+  title: `${pageNumber} Searchable Data Model Property`,
+}
+
+# {metadata.title}
+
+In this chapter, you'll learn what a searchable property is and how to define it.
+
+## What is a Searchable Property?
+
+Methods generated by the [service factory](../../modules/service-factory/page.mdx) that accept filters, such as `list{ModelName}s`, accept a `q` property as part of the filters.
+
+When the `q` filter is passed, the query is applied on searchable properties in a data model.
+
+---
+
+## Define a Searchable Property
+
+The `searchable` method of the `model` utility indicates that a `text` property is searchable.
+
+For example:
+
+```ts
+import { model } from "@medusajs/utils"
+
+const MyCustom = model.define("my_custom", {
+  name: model.text().searchable(),
+  // ...
+})
+
+export default MyCustom
+```
+
+In this example, the `name` property is searchable.
+
+### Search Example
+
+If you pass a `q` filter to the `listMyCustoms` method:
+
+```ts
+const myCustoms = await helloModuleService.listMyCustoms({
+  q: "John",
+})
+```
+
+The `q` filter is applied on the `name` property of the `MyCustom` records.