Update link to distill article on GPs
Note that this links to a *different* article from the previous one - we will add the old link back in as well once it is back online.
# - optimizing the model parameters
# - making predictions
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-# We focus here on the implementation of the models in GPflow; for more intuition on these models, see [A Practical Guide to Gaussian Processes](https://drafts.distill.pub/gp/).
+# We focus here on the implementation of the models in GPflow; for more intuition on these models, see [A Visual Exploration of Gaussian Processes](https://distill.pub/2019/visual-exploration-gaussian-processes/).
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