Added day 2 lesson 29 materials

Author: gperdrizet

notebooks/notebooks.yml

@@ -266,4 +266,10 @@ units:
           - name: "In-class demo, part 1"
             file: "Lesson_29_demo_part1.ipynb"
           - name: "Activity part 1"
-            file: "Lesson_29_activity_part1.ipynb "
+            file: "Lesson_29_activity_part1.ipynb "
+          - name: "Activity part 1 solution"
+            file: "Lesson_29_activity_part1_solution.ipynb"
+          - name: "In-class demo, part 2"
+            file: "Lesson_29_demo_part2.ipynb"
+          - name: "Activity part 2"
+            file: "Lesson_29_activity_part2.ipynb"