add motherduck connection guide (#180)

* add motherduck connection guide

* add motherduck guide

Author: johnymontana

agents/available-connections.mdx

@@ -60,7 +60,7 @@ agent card for the full list.
       </div>
 
   </Card>
-<Card>
+  <Card>
     <div className="flex items-center gap-2">
       <img
         src="/images/agents/connections/icons/neo4j-auradb.png"
@@ -85,6 +85,31 @@ agent card for the full list.
     </div>
 
   </Card>
+<Card>
+    <div className="flex items-center gap-2">
+      <img
+        src="/images/agents/connections/icons/motherduck.png"
+        alt="MotherDuck"
+        width={24}
+        height={24}
+      />
+      <span className="text-lg font-semibold">MotherDuck</span>
+    </div>
+    Serverless analytics platform powered by DuckDB
+     <div className="mt-4 flex items-center justify-between">
+      <span className="inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium bg-gray-100 text-gray-800">
+        1 tool
+      </span>
+
+      <a
+        href="/agents/connections/motherduck"
+        className="px-3 py-1 bg-gray-100 hover:bg-gray-200 dark:bg-gray-700 dark:hover:bg-gray-600 dark:text-gray-200 rounded"
+      >
+        Details
+      </a>
+    </div>
+
+  </Card>
   <Card>
     <div className="flex items-center gap-2">
       <img
@@ -1349,6 +1374,32 @@ agent card for the full list.
 ### Database
 
 <CardGroup cols={3}>
+<Card>
+    <div className="flex items-center gap-2">
+      <img
+        src="/images/agents/connections/icons/motherduck.png"
+        alt="MotherDuck"
+        width={24}
+        height={24}
+      />
+      <span className="text-lg font-semibold">MotherDuck</span>
+    </div>
+    Serverless analytics platform powered by DuckDB
+     <div className="mt-4 flex items-center justify-between">
+      <span className="inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium bg-gray-100 text-gray-800">
+        1 tool
+      </span>
+
+      <a
+        href="/agents/connections/motherduck"
+        className="px-3 py-1 bg-gray-100 hover:bg-gray-200 dark:bg-gray-700 dark:hover:bg-gray-600 dark:text-gray-200 rounded"
+      >
+        Details
+      </a>
+    </div>
+
+  </Card>
+
   <Card>
     <div className="flex items-center gap-2">
       <img