Rename externally facing components of project to be "jobs" rather than "CI builds"

[ScottG489]

This is the second step (after #14) to re-purposing and re-branding the service as a generic job runner rather than only a CI server.

After renaming internally facing names, components, and interfaces, we need to do the same for outwardly facing ones.

Some things we'll want to address::

• Change /build endpoint to something like /job or /run or likely /job/run
• The domain name should be changed to conjob.io
  • Be sure this is domain change is coordinated with other builds since there are a few projects that currently use this service for their CI builds.

Other things will likely be discovered as the work progresses.

#14 is a dependency of this issue.

[ScottG489]

Closed by:

b9a68ce
678e674
e74ef93
4a45295

Note that the old docker-ci-prototype/simple-ci is still running but will just not receive any updates. Anything using that server should be updated to point at the new service so the old one can be shut down.