docs(readme): add instructions to deploy via docker compose and via deta.space

docker/frontend.Dockerfile

@@ -0,0 +1,22 @@
+FROM node:21-alpine
+
+RUN mkdir /app
+RUN mkdir /prepare
+
+WORKDIR /prepare
+
+ADD package.json .
+
+RUN npm update -g npm --loglevel verbose
+COPY . .
+# RUN npm install --loglevel verbose
+RUN npm ci --omit=dev --no-audit --maxsockets 1 --loglevel verbose
+RUN npm run docker --loglevel verbose
+
+RUN cp -a ./build/. /app/
+
+WORKDIR /app
+RUN rm -rf /prepare
+RUN npm i sharp --loglevel verbose
+
+CMD ["node", "./server.js"]