Release ciigo v0.10.0 (2023-05-14)

=== New features

* all: bring back support for Markdown

  I use two remote repositories: GitHub and SourceHut.
  GitHub support rendering README using asciidoc while SourceHut not.
  This cause the repository that use README.adoc rendered as text in
  SourceHut which make the repository page less readable.

  Also, the pkg.go.dev now render README but only support Markdown.

  Since we cannot control the SourceHut and go.dev, the only option is
  to support converting Markdown in ciigo so I can write README using
  Markdown and the rest of documentation using Asciidoc.
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