docs: prep for v2 documentation (#6710)

This PR includes documentation that preps for v2 docs (but doesn't introduce new docs).

_Note: The number of file changes in the PR is due to find-and-replace within the `references` which is unavoidable. Let me know if I should move it to another PR._

## Changes

- Change Medusa version in base OAS used for v2.
- Fix to docblock generator related to not catching all path parameters.
- Added typedoc plugin that generates ER Diagrams, which will be used specifically for data model references in commerce modules.
- Changed OAS tool to output references in `www/apps/api-reference/specs-v2` directory when the `--v2` option is used.
- Added a version switcher to the API reference to switch between V1 and V2. This switcher is enabled by an environment variable, so it won't be visible/usable at the moment.
- Upgraded docusaurus to v3.0.1
- Added new Vale rules to ensure correct spelling of Medusa Admin and module names.
- Added new components to the `docs-ui` package that will be used in future documentation changes.

www/packages/docs-ui/src/components/LearningPath/Icon/index.tsx

@@ -0,0 +1,32 @@
+"use client"
+
+import clsx from "clsx"
+import React from "react"
+import { useLearningPath } from "../../.."
+
+type LearningPathIconProps = {
+  className?: string
+  imgClassName?: string
+} & React.AllHTMLAttributes<HTMLDivElement>
+
+export const LearningPathIcon = ({
+  className = "",
+  imgClassName = "",
+}: LearningPathIconProps) => {
+  const { baseUrl } = useLearningPath()
+
+  return (
+    <div
+      className={clsx(
+        "rounded-full shadow-card-rest dark:shadow-card-rest-dark w-docs_3 h-docs_3 bg-medusa-bg-base",
+        "flex justify-center items-center flex-none",
+        className
+      )}
+    >
+      <img
+        src={`${baseUrl}/images/learning-path-img.png`}
+        className={clsx("rounded-full w-docs_2.5 h-docs_2.5", imgClassName)}
+      />
+    </div>
+  )
+}