Added Dockerfile for lightweight deployment with Docker

Dockerfile

@@ -0,0 +1,13 @@
+# Create builder image with git and node-sass requirements
+FROM node:14-alpine AS builder
+COPY . ./nginxconfig
+WORKDIR /nginxconfig
+RUN apk add git
+RUN npm install node-sass
+RUN npm install
+RUN npm run build:prod
+
+# Only use the public nodejs portion for a lightweight container
+FROM nginx:1-alpine
+COPY --from=builder /nginxconfig/public/ /usr/share/nginx/html
+EXPOSE 80