Remove sys.path hack from demo.ipynb and add source code to PYTHONPATH in dockerfile

Author: finsberg

Dockerfile

@@ -16,4 +16,7 @@ USER root
 RUN chown -R ${NB_UID} ${HOME}
 
 USER ${NB_USER}
+
+ENV PYTHONPATH /repo/example-paper-fenics/code:${PYTHONPATH}
+
 ENTRYPOINT []

docs/demo.ipynb

@@ -40,25 +40,6 @@
     "!ls mesh"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "id": "f3327106",
-   "metadata": {},
-   "source": [
-    "Now we need to make sure that we can import the fuctions from the `code` folder. We can do this by adding the `code` folder to `sys.path`. "
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "2a251028",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "import sys\n",
-    "sys.path.insert(0, \"../code\")"
-   ]
-  },
   {
    "cell_type": "markdown",
    "id": "4610db02",