issues/65: resuse address/port for pprof and redirect servers

[komuw]

fixes: #65

[codecov-commenter]

Codecov Report

Merging #67 (26c2259) into main (a7ec7f7) will decrease coverage by 1.04%.
The diff coverage is 28.35%.

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
- Coverage   70.91%   69.86%   -1.05%     
==========================================
  Files          20       20              
  Lines        1530     1573      +43     
==========================================
+ Hits         1085     1099      +14     
- Misses        408      435      +27     
- Partials       37       39       +2     

Impacted Files	Coverage Δ
server/server.go	35.29% <0.00%> (-4.27%)	⬇️
server/pprof.go	88.70% <82.60%> (-11.30%)	⬇️

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