Fix sphinx issues according to numydoc documentation

Author: uvchik

doc/conf.py

@@ -157,7 +157,7 @@
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+html_static_path = []
 
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied

windpowerlib/wind_farm.py

@@ -58,9 +58,6 @@ class WindFarm(object):
     hub_height : float
         The calculated mean hub height of the wind farm. See
         :py:func:`mean_hub_height` for more information.
-    nominal_power : float
-        The nominal power is the sum of the nominal power of all turbines in
-        the wind farm in W.
     power_curve : :pandas:`pandas.DataFrame<frame>` or None
         The calculated power curve of the wind farm. See
         :py:func:`assign_power_curve` for more information.
@@ -210,9 +207,7 @@ def __repr__(self):
     @property
     def nominal_power(self):
         r"""
-        The nominal power of the wind farm.
-
-        See :attr:`~.wind_farm.WindFarm.nominal_power` for further information.
+        The nominal power is the sum of the nominal power of all turbines.
 
         Returns
         -------

windpowerlib/wind_turbine_cluster.py

@@ -35,9 +35,6 @@ class WindTurbineCluster(object):
     hub_height : float
         The calculated average hub height of the wind turbine cluster. See
         :py:func:`mean_hub_height` for more information.
-    nominal_power : float
-        The nominal power is the sum of the nominal power of all turbines in
-        the wind turbine cluster in W.
     power_curve : :pandas:`pandas.DataFrame<frame>` or None
         The calculated power curve of the wind turbine cluster. See
         :py:func:`assign_power_curve` for more information.
@@ -65,15 +62,13 @@ def __repr__(self):
     @property
     def nominal_power(self):
         r"""
-        The nominal power of the wind turbine cluster.
-
-        See :attr:`~.wind_turbine_cluster.WindTurbineCluster.nominal_power`
-        for further information.
+        The nominal power is the sum of the nominal power of all turbines in
+        the wind turbine cluster.
 
         Returns
         -------
         float
-            Nominal power of the wind turbine cluster in w.
+            Nominal power of the wind turbine cluster in W.
 
         """
         if not self._nominal_power: