Define MQTT and sensor configuration separately from implementation

[amotl]

About

The data logger uses a YAML file for configuration now, for example like etc/mois.yaml. You will then invoke it like:

pip install ds18b20-datalogger
wget https://github.com/hiveeyes/ds18b20-datalogger/raw/main/etc/mois.yaml
ds18b20-datalogger run mois.yaml

More

• Add subcommand make-config, for creating a configuration blueprint
• Add subcommand make-dashboard, for creating a Grafana Dashboard
• Add subcommand read, for acquiring and displaying a reading on STDOUT
• Tests: Bring code coverage back to 100%
• Improve documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (63e9a71) to head (6f88b05).

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #8   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         4    +2     
  Lines          153       148    -5     
=========================================
- Hits           153       148    -5     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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