DOC: add notebooks back in

Author: sjsrey

docs/_sources/notebooks/examples.ipynb.txt

@@ -0,0 +1,11 @@
+Tutorial
+========
+
+.. toctree::
+    :maxdepth: 1
+    :caption: Contents:
+
+    notebooks/weights.ipynb
+    notebooks/voronoi.ipynb
+    notebooks/examples.ipynb
+