remove pip-install commands from imf notebook

Author: slayoo

examples/immersion_freezing.ipynb

@@ -73,19 +73,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Install and import PyPartMC\n",
-    "try:\n",
-    "    import PyPartMC as ppmc\n",
-    "    from PyPartMC import si\n",
-    "except ImportError:\n",
-    "    !pip install git+https://github.com/slayoo/PyPartMC.git@freezing\n",
-    "    import PyPartMC as ppmc\n",
-    "    from PyPartMC import si\n",
-    "try:\n",
-    "    from open_atmos_jupyter_utils import show_plot\n",
-    "except ImportError:\n",
-    "    !pip install open_atmos_jupyter_utils\n",
-    "    from open_atmos_jupyter_utils import show_plot"
+    "import PyPartMC as ppmc\n",
+    "from PyPartMC import si\n",
+    "from open_atmos_jupyter_utils import show_plot"
    ]
   },
   {