Drop native Let's Encrypt support

[qwerty287]

closes #1680

[woodpecker-bot]

Deployment of preview was torn down

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 28.29%. Comparing base (786a8fb) to head (dae8a6d).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/server/server.go	0.00%	2 Missing ⚠️
cmd/server/health.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4541      +/-   ##
==========================================
+ Coverage   28.26%   28.29%   +0.02%     
==========================================
  Files         399      399              
  Lines       28179    28156      -23     
==========================================
  Hits         7966     7966              
+ Misses      19507    19484      -23     
  Partials      706      706              

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