Log Message:
sysutils/macchina: update to 0.8.21

-Merged a PR by @uttarayan21 that adds support for reading the configuration
file by specifying a path to the config file using --config, or using
MACCHINA_CONF environment variable.
-Merged a PR by @uttarayan21 that displays a warning when one or more of the
custom themes is conflicting with a built-in theme.
-Merged a PR by @FantasyTeddy that allows the processor readout to be printed
even if processor count fails to fetch.