remove the references to the obsolete energy_cal function from the ebike
and generic metrics notebooks
move the distance_miles calculation from the energy_intensity function to
a separate function called unit_conversions since we need it in all notebooks
fix the formatting of the generic_metrics_ebike_project, was probably
broken in some earlier merge.
energy_calfunction from the ebike and generic metrics notebooksdistance_milescalculation from theenergy_intensityfunction to a separate function calledunit_conversionssince we need it in all notebooksgeneric_metrics_ebike_project, was probably broken in some earlier merge.