Adding PDF links.

docs/_static/reference

@@ -0,0 +1 @@
+../../reference

docs/python.rst

@@ -190,4 +190,4 @@ Try changing the color of the three LEDs:
    >>>
 
 The color should change immediately. More information on these registers
-can be found in the `ICE40 LED Driver Usage Guide <reference/FPGA-TN-1288-ICE40LEDDriverUsageGuide.pdf>`__.
+can be found in the `ICE40 LED Driver Usage Guide <_static/reference/FPGA-TN-1288-ICE40LEDDriverUsageGuide.pdf>`__.

docs/requirements.rst

@@ -235,6 +235,8 @@ Which Fomu do I have?
 |                   | probably have one of these. Hacker boards have white silkscreen on      | silkscreen on it. This model of Fomu has a large silver crystal   |
 |                   | the back.                                                               | oscillator that is the tallest component on the board.            |
 +-------------------+-------------------------------------------------------------------------+-------------------------------------------------------------------+
+| **Schematic**     | `schematic-hacker.pdf <_static/reference/schematic-hacker.pdf>`__       | `schematic-pvt.pdf <_static/reference/schematic-pvt.pdf>`__       |
++-------------------+-------------------------------------------------------------------------+-------------------------------------------------------------------+
 | **Received at**   | From Tim at 35C3, CCCamp19, HackADay Supercon 2019                      | At RISC-V Summit 2019, 36C3, Crowdsupply, Mouser                  |
 +-------------------+-------------------------------------------------------------------------+-------------------------------------------------------------------+
 | **Buy more**      | End of Life                                                             | `CrowdSupply <https://j.mp/fomu-cs>`__,                           |