fix: remove the second venv creation as it might be confusing

Author: svalat

start.ipynb

@@ -26,24 +26,6 @@
     "git clone --recurse-submodules https://github.com/idefix-code/idefix.git idefix.src\n",
     "export IDEFIX_DIR=$PWD/idefix.src\n",
     "```\n",
-    "For conveniance, we set the `IDEFIX_DIR` environment variable to the absolute path of the root directory of idefix (as above). \n",
-    "\n",
-    "If you intend to use the python script provided in this tutorial, best is to deploy a python environement with everything already set up. \n",
-    "We therefore create a python environement in the directory `$IDEFIX_DIR/test` with the right modules\n",
-    "\n",
-    "```shell\n",
-    "cd $IDEFIX_DIR/test\n",
-    "python3 -m venv ./env\n",
-    "source env/bin/activate\n",
-    "pip install -r python_requirements.txt\n",
-    "```"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "6a5f21fb-2d61-4ab6-8539-a666b83ddc05",
-   "metadata": {},
-   "source": [
     "For conveniance, we set the `IDEFIX_DIR` environment variable to the absolute path of the root directory of idefix (as above). "
    ]
   },