Update dockerfile

Author: Jeff-Enriquez

Dockerfile

@@ -1,10 +1,10 @@
 # Stage 1 - the build process
 FROM node:latest as build-deps
 WORKDIR /usr/src/app
-COPY package.json yarn.lock ./
-RUN yarn
+COPY package.json package-lock.json ./
+RUN npm install
 COPY . ./
-RUN yarn build
+RUN npm run-script build
 # Stage 2 - the production environment
 FROM nginx:1.12-alpine
 COPY --from=build-deps /usr/src/app/build /usr/share/nginx/html