Frontend/backend project structure

+ Base implementation of a differential synchronization based on Neil
  Fraser article/talk

See https://www.youtube.com/watch?v=S2Hp_1jqpY8

Dockerfile

@@ -5,18 +5,19 @@ RUN apk add --no-cache nodejs npm git make
 COPY . /src
 WORKDIR /src
 
-RUN npm install && make build
+RUN make install-deps \
+    && make build
 
 FROM alpine:3.11
 
-COPY --from=build /src/dist /app
+COPY --from=build /src/client/dist /client
 
-WORKDIR /app
+WORKDIR /client
 
 RUN apk add --no-cache caddy
 
-COPY misc/dokku/Caddyfile /app/Caddyfile
-COPY misc/dokku/CHECKS /app/CHECKS
+COPY misc/dokku/Caddyfile /client/Caddyfile
+COPY misc/dokku/CHECKS /client/CHECKS
 
 EXPOSE 80