Remove source.css, beautify typing.css

typing.css is compiled from source.css
typing.css would be minified by hexo-all-minifier

themes/typing/makefile

@@ -1,17 +0,0 @@
-.PHONY: css
-css:
-	./node_modules/.bin/postcss --use postcss-import --use precss --use autoprefixer --use cssnano source/css/source.css --output source/css/typing.css
-
-.PHONY: copy
-copy:
-	mkdir -p ../hexo-theme-unit-test/themes/typing
-	cp -r ./layout ../hexo-theme-unit-test/themes/typing/
-	cp -r ./source ../hexo-theme-unit-test/themes/typing/
-	cp -r ./languages ../hexo-theme-unit-test/themes/typing/
-	cp -r ./_config.yml ../hexo-theme-unit-test/themes/typing/
-
-
-.PHONY: all
-all:
-	make css
-	make copy