feat: transition to a pm2-managed project

[e0ipso]

Use PM2 instead of homegrown process management.

[coveralls]

Pull Request Test Coverage Report for Build 87

• 34 of 34 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 83:	0.0%
Covered Lines:	209
Relevant Lines:	209

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💛 - Coveralls

[e0ipso]

:tada: This PR is included in version 0.17.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: