docs: integrate shipstation guide (#10623)

* first draft

* finalized first draft + added link to sidebar

* fix lint errors

* type changes

* updates to createFulfillment

* updates

* more updates

* add package weight

* added note about package

* fix up order items fulfillment

* add meta image

* address comment

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

@@ -595,6 +595,10 @@ export const filesMap = [
     "filePath": "/www/apps/resources/app/integrations/guides/sanity/page.mdx",
     "pathname": "/integrations/guides/sanity"
   },
+  {
+    "filePath": "/www/apps/resources/app/integrations/guides/shipstation/page.mdx",
+    "pathname": "/integrations/guides/shipstation"
+  },
   {
     "filePath": "/www/apps/resources/app/integrations/page.mdx",
     "pathname": "/integrations"