Deploy new Kitty Items demo API and events worker to Heroku

[psiemens]

Context

PR #27 merges in updates that require the events worker to always been running.

The current Heroku deployment does not include a dyno for the events worker.

Suggest a Solution

Create a Procfile with the following entries (inspired by this comment):

web:    node api/dist/index.js
worker: node api/dist/index.js --worker

This requires a change to the api project to make the worker to be runnable as a separate process.

Definition of Done

• kitty-items/api is updated to allow for separate API and worker processes
• Procfile is created with web and worker entries
• Demo Heroku deployment has been updated with the new Procfile

[10thfloor]

Nice. I can add this as part of #54 as well!

[10thfloor]

Closed by #54