Fixing broken image

src/data-structures/queues/Queues.ipynb

@@ -188,7 +188,7 @@
     "\n",
     "## Operations\n",
     "### `queue.enqueue`\n",
-    "![Enqueue](./enqueue.png#normal)\n",
+    "![Enqueue](./assets/enqueue.png)\n",
     "\n",
     "**Enqueue** is the insertion operation. The insertion occurs at the end of the queue. When the queue is empty the insertion adds a queue node and the wrapper tracks it in the head. As the node is the only element in the queue it has been tracked in the *head* but in the *tail* as well.\n",
     "\n",