Update the example grafana dashboard to add support for multiple
exporter instances. This includes updating panel queries and display
names.
The grafana version has been bumped to 9.1.8.
Rewrite the project README file to be more succinct and to the point. Add
new section on getting started quickly with either docker or the standalone
binary file.
Update CHANGELOG file with recent changes.
Add a basic systemd service file to serve as an example on how to run the
exporter as a system service. Add short README with an overview of the
service file.
