add links to nbviewer

Author: aleneum

examples/Frequently asked questions.ipynb

@@ -6,14 +6,18 @@
    "source": [
     "# Frequently asked questions\n",
     "\n",
-    "* [How do I load/save state machine configurations with json/yaml](./Frequently%20asked%20questions.ipynb#How-do-I-load/save-state-machine-configurations-with-json/yaml)\n",
+    "## Table of contents\n",
+    "\n",
+    "Links won't work on Github but should work with [nbviewer](https://nbviewer.org/github/pytransitions/transitions/blob/master/examples/Frequently%20asked%20questions.ipynb).\n",
+    "\n",
+    "* [How do I load/save state machine configurations with json/yaml](#How-do-I-load/save-state-machine-configurations-with-json/yaml)\n",
     "* [How to use transitions with django models?](#How-to-use-transitions-with-django-models?)\n",
     "* [transitions memory footprint is too large for my Django app and adding models takes too long.](#transitions-memory-footprint-is-too-large-for-my-Django-app-and-adding-models-takes-too-long.) \n",
     "* [Is there a during callback which is called when no transition has been successful?](#Is-there-a-'during'-callback-which-is-called-when-no-transition-has-been-successful?)\n",
     "* [How to have a dynamic transition destination based on a function's return value?](#How-to-have-a-dynamic-transition-destination-based-on-a-function's-return-value)\n",
     "* [Machine.get_triggers should only show valid transitions based on some conditions.](#Machine.get_triggers-should-only-show-valid-transitions-based-on-some-conditions.)\n",
     "* [Transitions does not add convencience methods to my model](#Transitions-does-not-add-convencience-methods-to-my-model)\n",
-    "* [I have several inter-dependent machines/models and experience deadlocks](./Frequently%20asked%20questions.ipynb#How-can-I-edit-a-graph's-styling)"
+    "* [I have several inter-dependent machines/models and experience deadlocks](#How-can-I-edit-a-graph's-styling)"
    ]
   },
   {

examples/Graph MIxin Demo.ipynb

@@ -6,6 +6,8 @@
    "source": [
     "### Table of Content \n",
     "\n",
+    "Links won't work on Github but should work with [nbviewer](https://nbviewer.org/github/pytransitions/transitions/blob/master/examples/Graph%20MIxin%20Demo.ipynb).\n",
+    "\n",
     "- [The Matter graph](#The-Matter-graph)\n",
     "- [Hide auto transitions](#Hide-auto-transitions)\n",
     "- [Previous state and transition notation](#Previous-state-and-transition-notation)\n",