issues/284: Use one server for ACME and app

[komuw]

• Use one server to handle ACME challenge requests and normal application requests.
  Prior to this, we had an app server and an ACME server that were both listening on the same port.
  This used to cause the two to clash since requests for one might end up been handled by http handlers for the other.

• Fixes: Acme server clashes with redirect server on port 80 #284

[codecov-commenter]

Codecov Report

Patch coverage: 46.66% and project coverage change: +0.39 🎉

Comparison is base (abf6729) 76.87% compared to head (9f8d319) 77.27%.

❗ Current head 9f8d319 differs from pull request most recent head 98ba1a0. Consider uploading reports for the commit 98ba1a0 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #287      +/-   ##
==========================================
+ Coverage   76.87%   77.27%   +0.39%     
==========================================
  Files          36       36              
  Lines        3460     3458       -2     
==========================================
+ Hits         2660     2672      +12     
+ Misses        672      652      -20     
- Partials      128      134       +6     

Impacted Files	Coverage Δ
middleware/middleware.go	95.45% <9.09%> (-4.55%)	⬇️
server/tls_conf.go	56.37% <41.66%> (+9.66%)	⬆️
client/client.go	84.07% <100.00%> (+0.28%)	⬆️
server/server.go	75.40% <100.00%> (+0.30%)	⬆️

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