remove unnecessary code

app.py

@@ -45,6 +45,7 @@ max_mean_line_length = st.sidebar.slider("Maximum average line length", 0, 2000,
 st.sidebar.markdown("Printed files have `max_line_length`  and `average_line_length` larger than the selected values.\
 `alphanumeric_fraction` is smaller than the selected value.")
 
+# load and filter dataset
 samples = load_data(chosen_language, chosen_ext)
 
 samples = samples.filter(
@@ -56,8 +57,6 @@ if not_lexable:
     samples = samples.filter(lambda x: not x["lexable"])
 
 max_docs = len(samples)
-samples = samples.add_column("idx", range(len(samples)))
-
 
 if max_docs > 0:
     col_1, _ = st.columns([3, 3])
@@ -70,7 +69,6 @@ if max_docs > 0:
             step=1,
         )
 
-    # info about the chosen example
     example = samples[index_example]
 
     st.markdown("#### File content:")