Improve usage instructions (#51)

Co-authored-by: Ramon

README.md

@@ -26,41 +26,24 @@ pip install finance-tracker
 1. Clone the repo
 2. Install [poetry](https://python-poetry.org)
 3. Run `make install`
-4. Load the categories and categories to filter as incomes wanted in a file called `categories.json`
-   in `./load/categories/`. Such as:
-    ```json
-    {
-      "CATEGORIES": {
-        "CATEGORY_ONE": [
-          "TITLE TO CATEGORIZE"
-        ],
-        "CATEGORY_TWO": [
-          "TITLE 2 TO CATEGORIZE"
-        ]
-      },
-      "POSITIVE_CATEGORIES": [
-        "CATEGORY_TWO"
-      ]
-    }
-    ```
+4. Set up the data as explained [here](#setting-up-the-data)
+5. Run `make run` and enjoy!
 
-5. Load your CSV files according to your bank under `./load/entries_files/{bank}` according to your bank.
-   See [Banks Supported](#banks-supported).
+### From package installation
 
-6. Load any other CSV files in the folder `./load/entries_files/`. By default, those files will have this format:
-    ```csv
-    HEADER1;;;;;
-    HEADER2;;;;;
-    DATE;DATE TWO;TITLE;OTHER DATA;QUANTITY;OTHER
-    01/01/1999;01/01/1999;PAYCHECK;PAYCHECK FROM COMPANY 1;1.000;1.000
+1. Follow the steps in [Installation](#installation)
+2. Set up the data as explained [here](#setting-up-the-data)
+3. Import it and use it in your project like this:
+    ```python
+    from finance_tracker.__main__ import run
+
+    if __name__ == "__main__":
+        run()
     ```
 
-7. Run `make run` and enjoy!
+## Setting up the data
 
-### From package installation
-
-1. Follow the steps in [Installation](#installation)
-2. Load the categories and categories to filter as incomes wanted in a file called `categories.json`
+1. Load the categories and categories to filter as incomes wanted in a file called `categories.json`
    in `./load/categories/`. Such as:
     ```json
     {
@@ -78,25 +61,17 @@ pip install finance-tracker
     }
     ```
 
-3. Load your CSV files according to your bank under `./load/entries_files/{bank}` according to your bank.
+2. Load your CSV files according to your bank under `./load/entries_files/{bank}` according to your bank.
    See [Banks Supported](#banks-supported).
 
-4. Load any other CSV files in the folder `./load/entries_files/`. By default, those files will have this format:
+3. Load any other CSV files in the folder `./load/entries_files/`. By default, those files will have this format:
     ```csv
     HEADER1;;;;;
     HEADER2;;;;;
     DATE;DATE TWO;TITLE;OTHER DATA;QUANTITY;OTHER
     01/01/1999;01/01/1999;PAYCHECK;PAYCHECK FROM COMPANY 1;1.000;1.000
     ```
 
-5. Import it and use it in your project like this:
-    ```python
-    from finance_tracker.__main__ import run
-
-    if __name__ == "__main__":
-        run()
-    ```
-
 ## Banks supported
 
 _Any other bank needs to be implemented or follow the current default CSV_