Install plugin with --user option for persistence (#744)

To ensure the package remains installed after server restarts, install the package into the home directory using the --user option. This directory is mounted as a  Docker volume, ensuring the package is preserved across server restarts.

plugin_list.ipynb

@@ -99,9 +99,9 @@
     "\n",
     "def install_package(package_name, pip, github, output_container, message_container, install_btn, remove_btn, accordion, index):\n",
     "    if pip:\n",
-    "        command = [\"pip\", \"install\", pip]\n",
+    "        command = [\"pip\", \"install\", pip, \"--user\"]\n",
     "    else:\n",
-    "        command = [\"pip\", \"install\", \"git+\" + github]\n",
+    "        command = [\"pip\", \"install\", \"git+\" + github, \"--user\"]\n",
     "    message_container.value = f\"\"\"<div style=\"color: #000000;\">Installing {package_name}...</div>\"\"\"\n",
     "    result = execute_command_with_output(command, output_container, install_btn, remove_btn)\n",
     "    # if the package was installed successfully\n",