A Markdown linter helps to unify the markup style of the content. The following short configuration changes a few rules of Markdownlint.

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# Line length should not be limited because we use soft wrapping
MD013: false  
# Empty lines above and below headings
MD022:
  lines_above: 1
  lines_below: 0
# Duplicate headings
MD024: 
  siblings_only: true
  allow_different_nesting: true
# Ordered list
MD029: 
  style: "ordered"
# No inline HTML. But because inline HTML is already skipped and removed
# with our Hugo configuration, the rule is not necessary. 
# And it would also be triggered by angled brackets intended for the typographer.
MD033: false 
# Images need to have an alternative description. But because Perplex allows to 
# provide it in the resources and issues a warning in case its missing, there is
# no need to throw this warning
MD045: false
# Codeblock style
MD046:
  style: "fenced"
# Emphasis style
MD049:
  style: "underscore"
# Strong style
MD050:
  style: "asterisk"  
MD051: false

There are also configuration files for Markdownlint in some content folders. They allow to document some variations of Markdown.