add docker support

Dockerfile

@@ -0,0 +1,8 @@
+FROM node:latest AS build
+ADD . /app
+WORKDIR /app
+RUN npm install && npm run build
+
+FROM nginx:stable
+COPY --from=build /app/dist /usr/share/nginx/html
+ADD nginx-site.conf /etc/nginx/conf.d/default.conf