Add Colab Notebooks to Website

[VMS-6511]

Colab notebooks have been created for the examples on the website. The TFE logo must still be added. Here are the links:

• Simple Average
• MNIST
• Federated Learning

[ianlivingstone]

@VMS-6511 can you provide links to the colab notebooks?

[VMS-6511]

• Simple Average: https://colab.research.google.com/drive/1l7vwdtNioYBSuLlOiPANZlBj7SIkRszX
• MNIST: https://colab.research.google.com/drive/1RGjru5T4bG1_kdTHTaUN9c3VmwqUVQrR
• Federated Learning: https://colab.research.google.com/drive/12kbQpD4K8pa7Sz2jfAzjtpqKrFsLeXWR