Merge branch 'adapt-nginx-acme-path-to-guide-recommendation' into 'develop'

Recommend the acme-challenge path that is used in the installation guides

See merge request !803
2 jobs for develop in 2 minutes and 3 seconds (queued for 2 seconds)
Name Stage Failure
unit-testing Test
== Compilation error in file test/web/common_api/common_api_test.exs ==
** (CompileError) test/web/common_api/common_api_test.exs:164: Pleroma.User.__struct__/0 is undefined, cannot expand struct Pleroma.User
(stdlib) lists.erl:1354: :lists.mapfoldl/3
(stdlib) lists.erl:1354: :lists.mapfoldl/3
(ex_unit) expanding macro: ExUnit.Assertions.assert/1
test/web/common_api/common_api_test.exs:164: Pleroma.Web.CommonAPI.Test."test pinned statuses should unpin when deleting a status"/1
(elixir) lib/code.ex:767: Code.require_file/2
(elixir) lib/kernel/parallel_compiler.ex:209: anonymous fn/4 in Kernel.ParallelCompiler.spawn_workers/6
ERROR: Job failed: exit code 1