move frontend Dockerfile to outer folder to meet the requirement of docker compose

Dockerfile

@@ -7,20 +7,20 @@ RUN npm config set "//npm.fontawesome.com/:_authToken" 58624E90-2685-43C6-BF0F-0
 RUN npm install -g http-server
 WORKDIR /app
 
-COPY package*.json ./
+COPY frontend/package*.json ./
 
 RUN npm install
 
-COPY *.js ./
-COPY *.html ./
-COPY src ./src
-COPY public ./public
+COPY frontend/*.js ./
+COPY frontend/*.html ./
+COPY frontend/src ./src
+COPY frontend/public ./public
 
 RUN npm run build
 
 # production stage
 FROM nginx:1.25.2 as production-stage
 COPY --from=build-stage /app/dist /usr/share/nginx/html
-COPY nginx_docker.conf /etc/nginx/conf.d/default.conf
+COPY frontend/nginx_docker.conf /etc/nginx/conf.d/default.conf
 EXPOSE 8080
 CMD ["nginx", "-g", "daemon off;"]