refactor: simplify config and refactor pp

[favonia]

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[codecov]

Codecov Report

Merging #69 (fb764fc) into main (105a6e1) will increase coverage by 3.15%.
The diff coverage is 52.35%.

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   69.05%   72.21%   +3.15%     
==========================================
  Files          21       24       +3     
  Lines        1173     1292     +119     
==========================================
+ Hits          810      933     +123     
+ Misses        358      355       -3     
+ Partials        5        4       -1     

Flag	Coverage Δ
unittests	72.21% <52.35%> (+3.15%)	⬆️

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

Impacted Files	Coverage Δ
cmd/ddns.go	0.00% <0.00%> (ø)
cmd/ip.go	0.00% <0.00%> (ø)
cmd/priviledges.go	0.00% <0.00%> (ø)
internal/api/fqdn.go	100.00% <ø> (ø)
internal/config/config.go	55.49% <22.38%> (+2.36%)	⬆️
internal/detector/http.go	82.22% <81.81%> (+0.40%)	⬆️
internal/api/cloudflare.go	100.00% <100.00%> (ø)
internal/config/env.go	100.00% <100.00%> (ø)
internal/detector/dns.go	96.22% <100.00%> (+0.03%)	⬆️
internal/detector/ip.go	100.00% <100.00%> (ø)
... and 10 more

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