Add MPH to pitch leaderboard

data.py

@@ -273,11 +273,12 @@ def compute_pitch_stats(df):
     df
     .group_by(['name', 'pitch_name'])
     .agg(
+        pl.len().alias('Count'),
         ((pl.col('whiff').sum() / pl.col('swing').sum()) * 100).round(1).alias('Whiff%'),
         ((pl.col('csw').sum() / pl.col('normal_pitch').sum()) * 100).round(1).alias('CSW%'),
-        pl.col('release_speed').mean().round(1).alias('Velocity'),
-        pl.len().alias('Count')
+        pl.col('release_speed').mean().round(1).alias('Velocity (KPH)'),
     )
+    .with_columns(pl.col('Velocity (KPH)').truediv(1.609).round(1).alias('Velocity (MPH)'))
     .sort(['name', 'Count'], descending=[False, True])
   )
   return pitch_stats