docs: improve link docs for commerce modules (#10726)

www/apps/resources/sidebars/currency.mjs

@@ -15,6 +15,17 @@ export const currencySidebar = [
         path: "/commerce-modules/currency/examples",
         title: "Examples",
       },
+      {
+        type: "sub-category",
+        title: "Concepts",
+        children: [
+          {
+            type: "link",
+            path: "/commerce-modules/currency/links-to-other-modules",
+            title: "Link to Modules",
+          },
+        ],
+      },
       {
         type: "sub-category",
         title: "References",

www/apps/resources/sidebars/customer.mjs

@@ -29,6 +29,11 @@ export const customerSidebar = [
             path: "/commerce-modules/customer/customer-accounts",
             title: "Customer Accounts",
           },
+          {
+            type: "link",
+            path: "/commerce-modules/customer/links-to-other-modules",
+            title: "Link to Modules",
+          },
         ],
       },
       {

www/apps/resources/sidebars/store.mjs

@@ -15,6 +15,17 @@ export const storeSidebar = [
         path: "/commerce-modules/store/examples",
         title: "Examples",
       },
+      {
+        type: "sub-category",
+        title: "Concepts",
+        children: [
+          {
+            type: "link",
+            path: "/commerce-modules/store/links-to-other-modules",
+            title: "Link to Modules",
+          },
+        ],
+      },
       {
         type: "sub-category",
         title: "References",