docs: update docusaurus to v3 (#5625)

* update dependencies

* update onboarding mdx

* fixes for mdx issues

* fixes for mdx compatibility

* resolve mdx errors

* fixes in reference

* fix check errors

* revert change in vale action

* fix node version in action

* fix summary in markdown

www/apps/docs/content/development/plugins/create.mdx

@@ -417,24 +417,21 @@ While you develop your plugin, you’ll need to test it on an actual Medusa back
 
 <Tabs groupId="plugin-preference">
   <TabItem value="without-admin" label="Without Admin Customizations" default>
+    In the root of your plugin directory, run the `build` command:
 
-  In the root of your plugin directory, run the `build` command:
-
-  ```bash
-  npm run build
-  ```
+    ```bash
+    npm run build
+    ```
 
   </TabItem>
   <TabItem value="with-admin" label="With Admin Customizations">
+    In the root of your plugin directory, run the `prepare` command:
 
-  In the root of your plugin directory, run the `prepare` command:
-
-  ```bash
-  npm run prepare
-  ```
-
-  If the `prepare` script is not available in your project, you can find it in [this section](#changes-for-admin-plugins).
+    ```bash
+    npm run prepare
+    ```
 
+    If the `prepare` script is not available in your project, you can find it in [this section](#changes-for-admin-plugins).
   </TabItem>
 </Tabs>
 
@@ -499,30 +496,30 @@ In the directory of the Medusa backend, start the backend with the `dev` command
 <Tabs groupId="npm2yarn" isCodeTabs={true}>
   <TabItem value="npm" label="npm" default>
 
-  ```bash
-  npm run dev -- -- --preserve-symlinks
-  ```
+    ```bash
+    npm run dev -- -- --preserve-symlinks
+    ```
 
   </TabItem>
   <TabItem value="yarn-1" label="Yarn v1">
 
-  ```bash
-  yarn dev -- -- --preserve-symlinks
-  ```
+    ```bash
+    yarn dev -- -- --preserve-symlinks
+    ```
 
   </TabItem>
   <TabItem value="yarn-berry" label="Yarn berry">
 
-  ```bash
-  yarn dev -- --preserve-symlinks
-  ```
+    ```bash
+    yarn dev -- --preserve-symlinks
+    ```
 
   </TabItem>
   <TabItem value="pnpm" label="pnpm">
 
-  ```bash
-  pnpm run dev -- -- --preserve-symlinks
-  ```
+    ```bash
+    pnpm run dev -- -- --preserve-symlinks
+    ```
 
   </TabItem>
 </Tabs>