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/edit-dates.mjs

@@ -119,7 +119,7 @@ export const generatedEditDates = {
   "app/deployment/medusa-application/railway/page.mdx": "2024-11-11T11:50:10.517Z",
   "app/deployment/storefront/vercel/page.mdx": "2024-07-26T07:21:31+00:00",
   "app/deployment/page.mdx": "2024-11-25T14:31:45.277Z",
-  "app/integrations/page.mdx": "2024-12-10T08:20:41.203Z",
+  "app/integrations/page.mdx": "2024-12-16T16:46:12.395Z",
   "app/medusa-cli/page.mdx": "2024-08-28T11:25:32.382Z",
   "app/medusa-container-resources/page.mdx": "2024-12-09T16:18:38.852Z",
   "app/medusa-workflows-reference/page.mdx": "2024-12-09T16:22:32.129Z",
@@ -5660,6 +5660,7 @@ export const generatedEditDates = {
   "references/types/DmlTypes/types/types.DmlTypes.RelationshipTypes/page.mdx": "2024-12-10T14:54:55.435Z",
   "app/recipes/commerce-automation/restock-notification/page.mdx": "2024-12-11T08:47:27.471Z",
   "app/troubleshooting/workflow-errors/page.mdx": "2024-12-11T08:44:36.598Z",
+  "app/integrations/guides/shipstation/page.mdx": "2024-12-23T07:48:47.719Z",
   "app/nextjs-starter/guides/customize-stripe/page.mdx": "2024-12-12T12:46:33.999Z",
   "references/core_flows/Cart/Workflows_Cart/functions/core_flows.Cart.Workflows_Cart.listShippingOptionsForCartWithPricingWorkflow/page.mdx": "2024-12-17T16:57:22.046Z",
   "references/core_flows/Cart/Workflows_Cart/variables/core_flows.Cart.Workflows_Cart.listShippingOptionsForCartWithPricingWorkflowId/page.mdx": "2024-12-17T16:57:22.044Z",