Feature/profile stagging

DockerFile.staging

+### STAGE 1: Build ###
+FROM node:12.7-alpine AS build
+WORKDIR /usr/src/app
+COPY package.json package-lock.json ./
+RUN npm install
+COPY . .
+RUN npm run build-staging
+
+### STAGE 2: Run ###
+FROM nginx:1.17.1-alpine
+COPY nginx.conf /etc/nginx/nginx.conf
+COPY --from=build /usr/src/app/dist/register-front /usr/share/nginx/html