remove coded games doc section

Author: edwardchalstrey1

doc/developer.catalog.rst

@@ -63,18 +63,3 @@ Currently supported representations are:
    .. warning::
 
       Make sure you commit all changed files e.g. run ``git add --all`` before committing and pushing.
-
-Code new games & add game families
-----------------------------------
-
-1. **Add the game code:**
-
-   Open `catalog/__init__.py` and create a new function, or modify an existing one. Ensure your function returns a ``Game`` object.
-   You may wish to vary the game title and/or description based on the chosen parameters.
-
-2. **Update the catalog:**
-
-   Update the dictionary returned by ``family_games()`` in `catalog/__init__.py` with all variants of your game(s) you want in the catalog.
-   Ensure each entry has unique game slug as key (this will be used by ``pygambit.catalog.load('slug')``), and returns a call of the function with specific parameters.
-
-3. **Submit a pull request to GitHub with all changes.**