Implement pagination for displayed dataframe in app.py

- Introduced start and end index variables to facilitate pagination of the dataframe display.
- Enhanced user experience by allowing users to view a subset of data at a time, improving performance and clarity.

app.py

@@ -238,7 +238,8 @@ with tab2:
                              format(formatter='{:.2%}', subset=st.session_state['stack_frame'].select_dtypes(include=['number']).columns),
                              hide_index=True)
 
-        # Display the paginated dataframe
+        start_idx = 0
+        end_idx = 500
         st.dataframe(
             working_df.iloc[start_idx:end_idx].style
             .background_gradient(axis=0)