Use npm instead of yarn in Dockerfile

There is a minor difference in syntax when starting the application
with `npm run serve`. We use `--` to make sure npm doesn't try to
parse the `--host 0.0.0.0` as an option, allowing it instead to be
read by Angular CLI (ng).

Also, there is no direct npm equivalent to yarn's --network-timeout
option so I will remove it. If we need something similar later we
might be able to use these config options:

    npm config set fetch-retry-mintimeout 300000
    npm config set fetch-retry-maxtimeout 300000

Dockerfile.dist

@@ -11,11 +11,11 @@ FROM node:18-alpine AS build
 RUN apk add --update python3 make g++ && rm -rf /var/cache/apk/*
 
 WORKDIR /app
-COPY package.json yarn.lock ./
-RUN yarn install --network-timeout 300000
+COPY package.json package-lock.json ./
+RUN npm install
 
 ADD . /app/
-RUN yarn build:prod
+RUN npm run build:prod
 
 FROM node:18-alpine
 RUN npm install --global pm2