Allows setting of image configs at a global level to act as default
values.
This required a change in the model.Image struct due to a bool field not
having a third, unset state. The remedy is to unmarshal into a temporary
data structure to detect the presents of a field value and then use that
to determine if the default value should be used.
Fixes#491
Configuration file not required anymore
DIUN_DB env var renamed DIUN_DB_PATH
Only accept duration as timeout value (10 becomes 10s)
Add getting started doc
Enhanced documentation
Add note about test notifications (#79)
Improve configuration management
Fix telegram init
All fields in configuration now camelCased
Improve configuration validation
Update doc
Update FAQ
Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>
