feat(pp): add an option to disable emojis

[favonia]

Close #262

[codecov]

Codecov Report

Merging #280 (b833843) into main (dc381ca) will increase coverage by 0.14%.
The diff coverage is 97.22%.

@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
+ Coverage   86.15%   86.29%   +0.14%     
==========================================
  Files          28       28              
  Lines        2015     2036      +21     
==========================================
+ Hits         1736     1757      +21     
  Misses        268      268              
  Partials       11       11              

Flag	Coverage Δ
unittests	86.29% <97.22%> (+0.14%)	⬆️

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Impacted Files	Coverage Δ
cmd/ddns.go	0.00% <0.00%> (ø)
internal/config/env.go	98.69% <100.00%> (+0.07%)	⬆️
internal/pp/fmt.go	100.00% <100.00%> (ø)

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