fix: aligment chart - convert df values to float in order to correctly render bar chart

Author: smallstepman

doc/python/bio-alignment-chart.md

@@ -47,7 +47,8 @@ import pandas as pd
 df = (pd.read_csv('https://raw.githubusercontent.com/plotly/datasets/master/Dash_Bio/Genetic/gene_conservation.csv')
         .set_index('0')
         .loc[['consensus','conservation']]
-        .T)
+        .T
+        .astype({"conservation": float}))
 
 fig = px.bar(df, labels={ 'index': 'base' }, hover_name='consensus', y='conservation')
 fig.show()