docs: add cloud database guides (#12758)

* docs: add cloud database guides

* fixes

* fixes

* small fix

www/apps/cloud/sidebar.mjs

@@ -39,6 +39,18 @@ export const sidebar = [
           },
         ],
       },
+      {
+        type: "category",
+        title: "Resources",
+        initialOpen: true,
+        children: [
+          {
+            type: "link",
+            title: "Database",
+            path: "/database",
+          },
+        ],
+      },
       {
         type: "category",
         title: "Monitoring & Support",