feat: use smaller base image in FE

Thanks to a suggestion by @nooreldeensalah I'll be making use of a smaller base image.

I hope the [Pr](udacity#56) gets merged for the next cohort

udagram-frontend/Dockerfile

@@ -1,15 +1,16 @@
 ## Build
-FROM beevelop/ionic:latest AS ionic
+FROM node:14.15.5-alpine3.13 as build
 # Create app directory
 WORKDIR /usr/src/app
 # Install app dependencies
 # A wildcard is used to ensure both package.json AND package-lock.json are copied
 COPY package*.json ./
 RUN npm ci
+RUN npm install -g @ionic/cli
 # Bundle app source
 COPY . .
 RUN ionic build
 ## Run 
 FROM nginx:alpine
 #COPY www /usr/share/nginx/html
-COPY --from=ionic  /usr/src/app/www /usr/share/nginx/html
+COPY --from=build /usr/src/app/www /usr/share/nginx/html