doc: rename hub rst file

Each hub will have its own RST file.

doc/ev3dev/hubs_ev3brick.rst

@@ -1,5 +1,5 @@
-:mod:`hubs` -- LEGO® Programmable Hubs
-=============================================
+:mod:`hubs` -- EV3 Brick
+==============================================
 
 .. automodule:: pybricks.hubs
     :no-members:

doc/ev3dev/index.rst

@@ -36,7 +36,7 @@ programs and start inventing your own programs.
    :caption: Pybricks Hubs
    :hidden:
 
-   ev3brick
+   hubs_ev3brick
 
 .. toctree::
    :maxdepth: 1

pybricks/ev3brick.py

@@ -1,9 +0,0 @@
-"""LEGO® MINDSTORMS® EV3 Brick."""
-
-from .builtins import Speaker, Display, Battery, ColorLight, KeyPad
-
-sound = Speaker()
-display = Display()
-battery = Battery()
-light = ColorLight()
-buttons = KeyPad()

pybricks/hubs.py

@@ -4,8 +4,7 @@ from .builtins import Speaker, Display, Battery, ColorLight, KeyPad
 
 
 class EV3Brick():
-    """LEGO® MINDSTORMS® EV3 Brick.
-    """
+    """LEGO® MINDSTORMS® EV3 Brick."""
     Port = Enum('Port', ['A', 'B', 'C', 'D', 'S1', 'S2', 'S3', 'S4'])
     speaker = Speaker()
     display = Display()