issues/182: remove log.Handler.StdLogger()

[komuw]

• slog from upstream, now has a function to get an old school logger; which we leverage in this PR.
• Updates: track go/issues/56345: structured, leveled logging #182

[codecov-commenter]

Codecov Report

Base: 72.60% // Head: 72.88% // Increases project coverage by +0.28% 🎉

Coverage data is based on head (f85c4ef) compared to base (ece5804).
Patch coverage: 81.27% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #219      +/-   ##
==========================================
+ Coverage   72.60%   72.88%   +0.28%     
==========================================
  Files          33       34       +1     
  Lines        2241     2191      -50     
==========================================
- Hits         1627     1597      -30     
+ Misses        532      516      -16     
+ Partials       82       78       -4     

Impacted Files	Coverage Δ
id/id.go	80.00% <0.00%> (+5.00%)	⬆️
middleware/client_ip.go	100.00% <ø> (ø)
server/cert.go	2.07% <0.00%> (+0.01%)	⬆️
server/server.go	46.66% <5.55%> (+1.10%)	⬆️
server/pprof.go	86.84% <66.66%> (-0.34%)	⬇️
log/log.go	83.33% <83.05%> (+1.93%)	⬆️
middleware/recoverer.go	90.62% <90.00%> (ø)
middleware/log.go	64.15% <94.11%> (-15.20%)	⬇️
client/client.go	88.73% <100.00%> (+0.32%)	⬆️
middleware/loadshed.go	74.50% <100.00%> (+5.88%)	⬆️
... and 5 more

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