Fix error from npm start script

[rfearing]

The project structure was broken up in such a way that sass, js, and php are in separate sub-directories under the src directory. To create a proper wp-content/themes/sparkpress theme folder within docker.

So that we didn't have to run a sass watcher/node watcher separate from a docker-compose up command (and so that they didn't happen in the wrong order) we created an npm start script that does both. However, if the terminal gets closed or if you stop the script you get errors about stopping docker. That should be fixed or a new solution should be created.