Feature/regression notebooks

[konst-int-i]

This PR

• Adds regression example notebook for the documentation and updates examples.rst accordingly

Run instructions:

• Make sure your facet-develop env is up to date
• Run make html from within the sphinx folder
• You should see the Regression notebook showing up in the "Examples" section

[jason-bentley]

Great stuff! Executed as instructed and yielded expected addition of regression worked examples in the FACET documentation, see below:

Also looked good on navigating through each section for the Predictive Maintenance Regression example.

Note if a future PR, the Regression machine failures on a water well notebook needs to be updated and added to the examples.rst file as follows:

Regression machine failures on a water well (simulated)
-----------------------------------------------------------
.. toctree::
   :maxdepth: 2

   tutorial/Regression_Water_Drilling_Simulation_Example