MAPG-78 use svgo instead of html-minifier

scripts/minify.sh

@@ -6,4 +6,4 @@ ROOT_DIR=$(dirname $(readlink -f "$0"))/..
 
 uglifyjs ${ROOT_DIR}/public/static/js/mapguesser.js -c -m -o ${ROOT_DIR}/public/static/js/mapguesser.js
 cleancss ${ROOT_DIR}/public/static/css/mapguesser.css -o ${ROOT_DIR}/public/static/css/mapguesser.css
-html-minifier ${ROOT_DIR}/public/static/img/loading.svg --collapse-whitespace --remove-comments -o ${ROOT_DIR}/public/static/img/loading.svg
+svgo ${ROOT_DIR}/public/static/img/loading.svg -o ${ROOT_DIR}/public/static/img/loading.svg