docs: fixes and preparations for workflows reference (#8579)

- Fix the merger configuration that adds the correct slug / sidebar labels
- Add an overview page for the workflows reference.
- Fixes to components and build scripts

www/apps/resources/generated/files-map.mjs

@@ -683,6 +683,10 @@ export const filesMap = [
     "filePath": "/www/apps/resources/app/medusa-container-resources/page.mdx",
     "pathname": "/medusa-container-resources"
   },
+  {
+    "filePath": "/www/apps/resources/app/medusa-workflows-reference/page.mdx",
+    "pathname": "/medusa-workflows-reference"
+  },
   {
     "filePath": "/www/apps/resources/app/nextjs-starter/page.mdx",
     "pathname": "/nextjs-starter"