Remove historical makefile targets

Makefile

@@ -11,8 +11,6 @@ endif
 
 DEFAULT_GOAL: smoke-sketches
 
-PLUGIN_TEST_SUPPORT_DIR ?= $(ARDUINO_DIRECTORIES_USER)/hardware/keyboardio/build-tools/
-PLUGIN_TEST_BIN_DIR ?= $(PLUGIN_TEST_SUPPORT_DIR)/../toolchain/$(shell gcc --print-multiarch)/bin
 
 setup: $(ARDUINO_DIRECTORIES_USER)/hardware/keyboardio/avr/boards.txt $(ARDUINO_DIRECTORIES_USER)/hardware/keyboardio/virtual/boards.txt $(ARDUINO_CLI_PATH) $(ARDUINO_DIRECTORIES_DATA)/arduino-cli.yaml  install-arduino-core-avr
 	@:
@@ -89,11 +87,6 @@ shellcheck:
 	fi
 
 
-check-docs:
-	doxygen $(PLUGIN_TEST_SUPPORT_DIR)/quality/etc/check-docs.conf 2> /dev/null >/dev/null
-	python $(PLUGIN_TEST_SUPPORT_DIR)/quality/doxy-coverage.py /tmp/undocced/xml
-
-
 SMOKE_SKETCHES=$(sort $(shell if [ -d ./examples ]; then find ./examples -type f -name \*ino | xargs -n 1 dirname; fi))
 
 smoke-sketches: $(SMOKE_SKETCHES)