build(docs): Remove custom submodules in docs (#169)

Author: emlaver

tox.ini

@@ -21,5 +21,5 @@ exclude = .venv,.git,.tox,docs
 description = invoke sphinx-build to build the HTML docs
 deps = {[testenv]deps}
 basepython = python3.6
-commands = sphinx-apidoc -o {toxinidir}/source ibmcloudant
+commands = sphinx-apidoc -o {toxinidir}/source ibmcloudant "**/common.py" "**/version.py" "**/cloudant_base_service.py" "**/couchdb_session_get_authenticator_patch.py"
            sphinx-build -d "{toxinidir}/docs_doctree" {toxinidir}/source "{toxinidir}/apidocs" --color -bhtml