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/apps/api-reference/providers/sidebar.tsx

@@ -1,9 +1,11 @@
 "use client"
 import {
   SidebarProvider as UiSidebarProvider,
+  mobileSidebarItems,
   usePageLoading,
   useScrollController,
 } from "docs-ui"
+import { config } from "../config"
 
 type SidebarProviderProps = {
   children?: React.ReactNode
@@ -19,42 +21,7 @@ const SidebarProvider = ({ children }: SidebarProviderProps) => {
       setIsLoading={setIsLoading}
       shouldHandleHashChange={true}
       scrollableElement={scrollableElement}
-      initialItems={{
-        top: [
-          {
-            title: "Introduction",
-            path: "",
-            loaded: true,
-          },
-        ],
-        bottom: [],
-        mobile: [
-          {
-            title: "Docs",
-            path: "https://docs.medusajs.com/",
-            loaded: true,
-            isPathHref: true,
-          },
-          {
-            title: "User Guide",
-            path: "https://docs.medusajs.com/user-guide",
-            loaded: true,
-            isPathHref: true,
-          },
-          {
-            title: "Store API",
-            path: "/api/store",
-            loaded: true,
-            isPathHref: true,
-          },
-          {
-            title: "Admin API",
-            path: "/api/admin",
-            loaded: true,
-            isPathHref: true,
-          },
-        ],
-      }}
+      initialItems={config.sidebar}
     >
       {children}
     </UiSidebarProvider>