docs: added plugins documentation (#10989)

(Should be merged after the next release)

Closes DX-1294

www/apps/resources/sidebars/plugins.mjs

@@ -0,0 +1,20 @@
+/** @type {import('types').RawSidebarItem[]} */
+export const pluginsSidebar = [
+  {
+    type: "link",
+    title: "Overview",
+    path: "/plugins",
+  },
+  {
+    type: "category",
+    title: "Guides",
+    children: [
+      {
+        type: "link",
+        title: "Wishlist",
+        path: "/plugins/guides/wishlist",
+        description: "Learn how to build a wishlist plugin.",
+      },
+    ],
+  },
+]