docs: Add indexes and properly declare modules

Signed-off-by: Rahix <rahix@rahix.de>

Documentation/index.rst

@@ -47,3 +47,10 @@ Last but not least, if you want to start hacking the lower-level firmware, the
    epicardium/overview
    epicardium/api
    epicardium-guide
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`

Documentation/pycardium/color.rst

@@ -21,6 +21,8 @@ The color module also contains a few constanst for commonly used colors:
 .. py:data:: color.MAGENTA
 .. py:data:: color.CYAN
 
+.. py:module:: htmlcolor
+
 ``htmlcolor`` - Color Constants
 ===============================
 The ``htmlcolor`` module contains even more color constants.  Note

Documentation/pycardium/light-sensor.rst

+.. py:module:: light_sensor
+
 ``light_sensor`` - Ambient Brightness
 =====================================
 On the harmonic board, there is an IR-LED which can be used in reverse as a

Documentation/pycardium/utime.rst

+.. py:module:: utime
+
 ``utime`` - Time
 ================
 The ``utime`` module loosely follows CPython's |time|_ module, but is heavily

Documentation/pycardium/vibra.rst

+.. py:module:: vibra
+
 ``vibra`` - Vibration Motor
 ===========================