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

rl_coach/agents/qr_dqn_agent.py

@@ -34,6 +34,14 @@ class QuantileRegressionDQNNetworkParameters(DQNNetworkParameters):
 
 
 class QuantileRegressionDQNAlgorithmParameters(DQNAlgorithmParameters):
+    """
+    :param atoms: (int)
+        the number of atoms to predict for each action
+
+    :param huber_loss_interval: (float)
+        One of the huber loss parameters, and is referred to as :math:`\kapa` in the paper.
+        It describes the interval [-k, k] in which the huber loss acts as a MSE loss.
+    """
     def __init__(self):
         super().__init__()
         self.atoms = 200