Rename frontend to ng-app

Dockerfile

@@ -1,12 +1,12 @@
 FROM node:alpine as builder
 
 WORKDIR /build
-COPY frontend/package.json frontend/package-lock.json ./
+COPY ng-app/package.json ng-app/package-lock.json ./
 
 RUN npm install && mkdir /ng-app && cp -r node_modules/ /ng-app
 
 WORKDIR /ng-app
-COPY frontend .
+COPY ng-app .
 
 RUN $(npm bin)/ng build --prod --build-optimizer --output-hashing=none