Merge pull request 'fix: add demo/ folder to Dockerfile so /demo route works in container' (#34) from feature/demo-dockerfile into master

Reviewed-on: #34

Dockerfile

@@ -21,6 +21,7 @@ COPY server.js    ./
 COPY package.json ./
 COPY db/          ./db/
 COPY pdf/         ./pdf/
+COPY demo/        ./demo/
 COPY client/public/static ./client/dist/static
 RUN mkdir -p /data
 EXPOSE 3001