CircleCI 2 Support

[88kami88]

In addition to migrating to CircleCI version 2.0, this PR also removes the publish step, as it was not working.-

Also sets up CircleCI workflows for future use.

Opting for manually publishes for the time being. I have verified my ability to publish and anyone else at Formidable should be able to in a pinch, as well.

@ryan-roemer

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[88kami88]

Checks are redundant now that we're using workflows. Need to fix.

[88kami88]

Checks resolved.

[ryan-roemer]

@ethersage -- Config changes and the actual builds kicked off look good. Nice work!!!

We do still have maintainerd operating, just without the ./deploy.sh script in gear. Let me know if you'd like me to disable that, or we can just keep it going as-is if it's working with our dev workflows.