Remove a ton of leftover MicroPython code and abstractions, including all of kmk.pins

kmk/boards/converter/keebio/bdn9.py

@@ -2,10 +2,19 @@ import board
 
 from kmk.consts import DiodeOrientation
 from kmk.mcus.circuitpython_usbhid import KeyboardConfig as _KeyboardConfig
-from kmk.pins import Pin as P
 
 
 class KeyboardConfig(_KeyboardConfig):
-    col_pins = (P.RX, P.D13, P.A0, P.D11, P.A4, P.A5, P.D10, P.D9, P.SCK)
+    col_pins = (
+        board.RX,
+        board.D13,
+        board.A0,
+        board.D11,
+        board.A4,
+        board.A5,
+        board.D10,
+        board.D9,
+        board.SCK,
+    )
     diode_orientation = DiodeOrientation.COLUMNS
     rgb_pixel_pin = board.TX