add a very basic docker image (#299)

Dockerfile

@@ -0,0 +1,20 @@
+FROM node:alpine as builder
+
+WORKDIR /app
+
+COPY package.json yarn.lock ./
+
+RUN yarn install
+
+COPY . .
+
+RUN yarn run build
+
+FROM nginx:alpine
+
+# Copy the static website files to the default Nginx serve directory
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+EXPOSE 80
+
+# Nginx will start automatically