title: Auto generate documentation for sub packages using Sphinx
body: <p>My project has several packages and submodules. All of them have docstrings, so I'd like to automatically generate recursive sphinx documentation for all the project.</p>
  
  <p>I see there are autodoc and autosummary extensions, but I can't make them work and I can't find clear guides about this.</p>
  
  <p>Any hint?</p>