Automatically Generating Documentation for All Python Package Contents

I'm trying to auto-generate basic documentation for my codebase using Sphinx. However, I'm having difficulty instructing Sphinx to recursively scan my files.

I have a Python codebase with a folder structure like:

<workspace>
└── src
    └── mypackage
        ├── __init__.py
        │   
        ├── subpackageA
        │   ├── __init__.py
        │   ├── submoduleA1
        │   └── submoduleA2
        │   
        └── subpackageB
            ├── __init__.py
            ├── submoduleB1
            └── submoduleB2

I ran sphinx-quickstart in <workspace>, so now my structure looks like:

<workspace>
├── src
│   └── mypackage
│       ├── __init__.py
│       │
│       ├── subpackageA
│       │   ├── __init__.py
│       │   ├── submoduleA1
│       │   └── submoduleA2
│       │
│       └── subpackageB
│           ├── __init__.py
│           ├── submoduleB1
│           └── ubmoduleB2
│
├── index.rst
├── _build
├── _static
└── _templates  

I've read the quickstart tutorial, and although I'm still trying to understand the docs, the way it's worded makes me concerned that Sphinx assumes I'm going to manually create documentation files for every single module/class/function in my codebase.

However, I did notice the "automodule" statement, and I enabled autodoc during quickstart, so I'm hoping most of the documentation can be automatically generated. I modified my conf.py to add my src folder to sys.path and then modified my index.rst to use automodule. So now my index.rst looks like:

Contents:

.. toctree::
   :maxdepth: 2

Indices and tables
==================

* :ref:`genindex`
* :ref:`modindex`
* :ref:`search`

.. automodule:: alphabuyer
   :members:

I have dozens of classes and functions defined in the subpackages. Yet, when I run: