This site lives at http://wwww.tavnermurphy.com
The remote for the production host is https://git.heroku.com/tav-murphy-profile.git
In case you need to rebuild the node_modules on Heroku, you'll need to make sure that the NODE_MODULES_CACHE on Heroku is set to false.
heroku config:set NODE_MODULES_CACHE=false
More here
Once development is ready, you can push directly to Heroku.
git push heroku master
You can also push other branches to Heroku for whatever use case comes up (e.g. testing) as there is no separate staging site as of October 7th, 2019.
git push heroku dev:master
The postinstall key within the scripts section of the package.json is how Heroku deploys Node.js projects. You can learn more here