Channel warning and closure messages should be templated

[ahalasz]

Hi,

I changed the archive_threshold to 37 in the configuration.yaml. Afterwards I rebuilt the destalinator Docker image, run it and entered the container. In the container I run the warner.py, which send a message to the concerned channels in the Slack.

The message in #general was:

Hey, heads up -- the following channels are stale and will be archived if no one participates in them over the next 30 days

The message in the concerned channels ended with

.If we don't hear from anyone in the next 30 days, this channel will be archived.

I was expecting to see 7 days instead of 30 days in those messages.

Extract of the con figuration.yaml:

# Days of silence before we warn a channel it's going to be archived
warn_threshold: 30

# Days of silence before we auto-archive a channels
archive_threshold: 37

[kmarekspartz]

These are currently hardcoded in:

https://github.com/randsleadershipslack/destalinator/blob/master/warning.txt
and
https://github.com/randsleadershipslack/destalinator/blob/master/closure.txt

Updating those to be templated is reasonable, though we could hard code the warn and archive thresholds everywhere, as they are decent defaults.

[ax42]

Recommend they are either hard-coded everywhere (i.e. not a parameter at all) or templated. Parameters are clearly more user-friendly. For our company slack we would prefer to have a shorted archive threshold (warn, and then archive quickly, not give another 30 days).