Rename "Firmware" to "KeyboardConfig" for clarity in main.py and to illustrate separation of KeyboardConfig/InternalState

docs/tapdance.md

@@ -40,11 +40,11 @@ Here's an example of all this in action:
 
 ```python
 # user_keymaps/some_silly_example.py
-from kmk.boards.klarank import Firmware
+from kmk.boards.klarank import KeyboardConfig
 from kmk.keycodes import KC
 from kmk.macros.simple import send_string
 
-keyboard = Firmware()
+keyboard = KeyboardConfig()
 
 keyboard.tap_time = 750