Remove predictive_finder (#330)

* dpf

* fix example

Author: aloctavodia

docs/examples/observed_space_examples.ipynb

@@ -1,6 +1,5 @@
 from .ppa import ppa
 from .predictive_explorer import predictive_explorer
-from .predictive_finder import predictive_finder
 
 
-__all__ = ["ppa", "predictive_explorer", "predictive_finder"]
+__all__ = ["ppa", "predictive_explorer"]