Created sphinx documentation files with

  sphinx-apidoc -A "J. Katzwinkel" -F -o docs/ kathaireo/

and hopefully stated correct path in docs/conf.py
Changed import statements to relative module paths hoping this would
let sphinx find everything it looks for. This appeared to require to
also move main module kathaireo.py up one level, out of kathaireo
package. After doing all this update, all imports work, even in sphinx.

Because sphinx is not that complicated after all, I began modifying
existing docstrings to work with sphinx, which right now seems fairly
satisfied and produces already pretty nice html output, which is
located at docs/_build and included in this commit.