fix: make the quiet mode quieter

[favonia]

The single-run mode enabled by #411 (requested by #409) made it obvious that the quiet mode should be quieter. A few areas to improve:

• updater version printing
• privilege dropping
• "Bye!"
• config errors other than parsing templates
• parsing errors

[codecov]

Codecov Report

Merging #415 (03b9b81) into main (9ddc185) will increase coverage by 0.49%.
The diff coverage is 55.95%.

@@            Coverage Diff             @@
##             main     #415      +/-   ##
==========================================
+ Coverage   87.71%   88.20%   +0.49%     
==========================================
  Files          33       35       +2     
  Lines        2075     2078       +3     
==========================================
+ Hits         1820     1833      +13     
+ Misses        243      234       -9     
+ Partials       12       11       -1     

Flag	Coverage Δ
unittests	88.20% <55.95%> (+0.49%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/ddns/ddns.go	0.00% <0.00%> (ø)
internal/droproot/checker.go	0.00% <0.00%> (ø)
internal/droproot/config.go	0.00% <0.00%> (ø)
internal/droproot/drop.go	0.00% <0.00%> (ø)
internal/config/config.go	100.00% <100.00%> (+1.18%)	⬆️
internal/config/env.go	98.80% <100.00%> (+0.11%)	⬆️
internal/domainexp/lexer.go	87.50% <100.00%> (ø)
internal/domainexp/parser.go	100.00% <100.00%> (ø)

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