Refactor grab_contest_data function to return DataFrame instead of CSV

- Updated the grab_contest_data function to return the merged DataFrame directly, allowing for more flexible data handling.
- Enhanced load_contest_file function to support loading DataFrames directly, improving usability for users who may work with DataFrames in their workflow.

global_func/grab_contest_data.py

@@ -69,4 +69,4 @@ def grab_contest_data(sport, contest_name, contest_id_map, contest_date_map):
 
     total_data = lineups_df.merge(players_df, how='left', left_index=True, right_index=True)
     
-    return total_data.to_csv(f'{contest_name}.csv', index=False)
+    return total_data

global_func/load_contest_file.py

@@ -9,6 +9,8 @@ def load_contest_file(upload, sport):
                 raw_df = pd.read_csv(upload)
             elif upload.name.endswith(('.xls', '.xlsx')):
                 raw_df = pd.read_excel(upload)
+            elif isinstance(upload, pd.DataFrame):
+                raw_df = upload
             else:
                 st.error('Please upload either a CSV or Excel file')
                 return None