Add automatic builds for my yoshi theme colors

GNUmakefile

@@ -1,4 +1,4 @@
-.PHONY: publish deploy html css help
+.PHONY: publish deploy html css help theme
 
 help:							## Show this help
 	@egrep -h '\s##\s' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'
@@ -33,3 +33,9 @@ clean:							## Remove all of the build files
 
 serve:						   ## Run a simple web server to look at the results
 	@cd public && php -S localhost:8000
+
+theme:							## Generate the theme CSS
+	eldev emacs --quick --batch --load htmlize --load ox-html \
+	    -eval "(setq org-html-htmlize-output-type 'css)" \
+	    -funcall org-html-htmlize-generate-css \
+	    -eval '(write-file "src/less/yoshi.css")'