Rename aux -> aux_data

This is to ensure compatibility with MS DOS file naming requirements (https://learn.microsoft.com/en-ca/windows/win32/fileio/naming-a-file).

README.md

@@ -59,11 +59,11 @@ RFSD = load_dataset('irlspbru/RFSD')
 RFSD_2023 = pl.read_parquet('hf://datasets/irlspbru/RFSD/RFSD/year=2023/*.parquet')
 ```
 
-We provide a file in `aux/descriptive_names_dict.csv` in [GitHub repository](https://github.com/irlcode/RFSD) which can be used to change the original names of financial variables to user-friendly ones, e.g. `B_revenue` and `CFo_materials` in lieu of `line_2110` and `line_4121`, respectively. Prefixes are for disambiguation purposes: `B_` stands for balance sheet variables, `PL_` — profit and loss statement, `CFi_` and `CFo` — cash inflows and cash outflows, etc. (One can find all the variable definitions in the supplementary materials table in the accompanying paper and [consult](https://www.consultant.ru/document/cons_doc_LAW_32453/) the original statement forms used by firms: full is `KND 0710099`, simplified — `KND 0710096`.)
+We provide a file in `aux_data/descriptive_names_dict.csv` in [GitHub repository](https://github.com/irlcode/RFSD) which can be used to change the original names of financial variables to user-friendly ones, e.g. `B_revenue` and `CFo_materials` in lieu of `line_2110` and `line_4121`, respectively. Prefixes are for disambiguation purposes: `B_` stands for balance sheet variables, `PL_` — profit and loss statement, `CFi_` and `CFo` — cash inflows and cash outflows, etc. (One can find all the variable definitions in the supplementary materials table in the accompanying paper and [consult](https://www.consultant.ru/document/cons_doc_LAW_32453/) the original statement forms used by firms: full is `KND 0710099`, simplified — `KND 0710096`.)
 
 ``` Python
 # Give suggested descriptive names to variables
-renaming_df = pl.read_csv('https://raw.githubusercontent.com/irlcode/RFSD/main/aux/descriptive_names_dict.csv')
+renaming_df = pl.read_csv('https://raw.githubusercontent.com/irlcode/RFSD/main/aux_data/descriptive_names_dict.csv')
 RFSD = RFSD.rename({item[0]: item[1] for item in zip(renaming_df['original'], renaming_df['descriptive'])})
 ```