feat: read overrides from breaktimer.conf

Every tunable was a variable in a tracked script, so a personal value could
only live as an uncommittable edit. The repository copy and the installed
copy had already drifted over three sound paths pointing into a home
directory, which is the argument in one line.

Bash sources files natively: no format, no parser, and a syntax error is a
bash error at start rather than a silent fallback to a default.

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