refactoring by responsibility

Dockerfile

@@ -9,6 +9,8 @@ COPY nginx.conf /etc/nginx/conf.d/default.conf
 # Copy source code web và thư mục ảnh vào
 COPY index.html /usr/share/nginx/html/
 COPY robots.txt sitemap.xml /usr/share/nginx/html/
+COPY css/ /usr/share/nginx/html/css/
+COPY js/ /usr/share/nginx/html/js/
 COPY images/ /usr/share/nginx/html/images/
 
 EXPOSE 80