1) Fixed: FutureWarnings

2) Updated the notebook to follow the consistent style
3) Use arviz functions directly for plotting on inference data

Fromat the notebook in Black-format

Minor formatting

minor change to execute last cell

Minor text changes.

Renaming file

update the filename in the doc: PyMC3_tips_and_heuristic.ipynb to conditional-autoregressive-model.ipynb

Minos change to remove .ipynb from the name

Move conditional-autoregressive-mode.ipynb from tutorial "How-To" to examples "Gaussian Processes"

Author: AmitKus