update of api docstrings across coach and tutorials [WIP] (#91)

* updating the documentation website
* adding the built docs
* update of api docstrings across coach and tutorials 0-2
* added some missing api documentation
* New Sphinx based documentation

docs_raw/source/_templates/layout.html

@@ -0,0 +1,4 @@
+{% extends "!layout.html" %}
+{% block extrahead %}
+    <link href="{{ pathto("_static/css/custom.css", True) }}" rel="stylesheet" type="text/css">
+{% endblock %}