Actually clean BUILDDIR by removing it completely, not just stuff inside it

Author: stevepiercy

Makefile

@@ -26,11 +26,11 @@ help:  # This help message
 
 .PHONY: clean
 clean:  # Clean docs build directory
-	cd $(DOCS_DIR) && rm -rf $(BUILDDIR)/*
+	cd $(DOCS_DIR) && rm -rf $(BUILDDIR)/
 
 .PHONY: distclean
 distclean:  # Clean docs build directory and Python virtual environment
-	cd $(DOCS_DIR) && rm -rf $(BUILDDIR)/*
+	cd $(DOCS_DIR) && rm -rf $(BUILDDIR)/
 	rm -rf ./bin/ ./lib/ ./lib64 ./include ./pyvenv.cfg
 
 bin/python: