Cleaned up CI/CD steps, fixed README, fixed noxfile.
- Merged the "build" and "deploy" steps. It was silly having these separate and wasteful of time and processing power.
- Added steps in the README.rst for plugin developers to be able to run pygeoapi locally as they are developing their tools.
- Added "docker-build" and "docker-run" sessions for nox. These are not included in the main sequence of tests, as they are for the plugin developers to easily fire up a build.
Signed-off-by: Cliff Hill chill@contractor.usgs.gov