Remove electron microscopy notebook since they moved to other repositories

1_Getting_Started.ipynb

@@ -100,9 +100,7 @@
     "    \n",
     "However, in order to enable interactive plotting in IPython we need to activate the matplotlib \"backend\" first using the [%matplotlib IPython magic](http://ipython.readthedocs.io/en/stable/interactive/plotting.html).\n",
     "\n",
-    "**NOTE:** A \"backend\" in this context refers to the code, that determines in which way plotted data will be displayed. In the online version of this document we use the `inline` backend that displays non-interactive figures inside the Jupyter Notebook. However, for interactive data analysis purposes most would prefer to use the `qt4`, `wx` or `nbagg` backends. \n",
-    "    \n",
-    " "
+    "**NOTE:** A \"backend\" in this context refers to the code, that determines in which way plotted data will be displayed. In the online version of this document we use the `inline` backend that displays non-interactive figures inside the Jupyter Notebook. However, for interactive data analysis purposes most would prefer to use the `qt` or `widget` backends. When running the notebook from the cloud (for example on [Binder](https://mybinder.org), Google Cloud Platform), only the `widget` or `inline` backend can to be used."
    ]
   },
   {
@@ -121,8 +119,8 @@
    ],
    "source": [
     "# This is a Python comment line - anything after a hashtag is a non-executed comment\n",
-    "%matplotlib nbagg \n",
-    "# You can replace 'nbagg' with any other available toolkit e.g 'qt4', 'tk'...\n",
+    "%matplotlib widget \n",
+    "# You can replace 'widget' with any other available toolkit e.g 'qt',\n",
     "import hyperspy.api as hs\n",
     "# Don't worry about the warning below, they're just for information"
    ]