Add CVaR optimization tutorial (#1057)

* add cvar tutorial

* update cvar tutorial

* Update 8_cvar_optimization.ipynb

* Update 8_cvar_optimization.ipynb

* Update 8_cvar_optimization.ipynb

* Update 8_cvar_optimization.ipynb

* Update 8_cvar_optimization.ipynb

* add thumbnails to new optimization tutorials

* Update 8_cvar_optimization.ipynb

Co-authored-by: Paul Nation <nonhermitian@gmail.com>

Author: stefan-woerner

tutorials/optimization/6_examples_max_cut_and_tsp.ipynb

@@ -449,7 +449,9 @@
    "execution_count": 10,
    "metadata": {
     "scrolled": true,
-    "tags": []
+    "tags": [
+     "nbsphinx-thumbnail"
+    ]
    },
    "outputs": [
     {
@@ -1076,7 +1078,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.5"
+   "version": "3.7.4"
   },
   "varInspector": {
    "cols": {

tutorials/optimization/7_examples_vehicle_routing.ipynb

@@ -432,7 +432,11 @@
   {
    "cell_type": "code",
    "execution_count": 8,
-   "metadata": {},
+   "metadata": {
+    "tags": [
+     "nbsphinx-thumbnail"
+    ]
+   },
    "outputs": [
     {
      "data": {
@@ -817,6 +821,7 @@
   }
  ],
  "metadata": {
+  "celltoolbar": "Tags",
   "kernelspec": {
    "display_name": "Python 3",
    "language": "python",
@@ -832,7 +837,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.7"
+   "version": "3.7.4"
   },
   "varInspector": {
    "cols": {
@@ -866,4 +871,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 1
-}
+}