Release ciigo v0.13.1 (2024-08-04)

=== Bug fixes

* Fix "serve" not detecting new files::

  If there is new files on the root of directory it will not detected
  automatically. This release now fix this issue.

=== Others

* all: remove Limitations and update Links

  The asciidoc-go library now support scanning symlink inside Root
  directory. The Links sections merge the previous contents from old
  index.adoc.

* all: update the CLI usage in the README

  There are three places for command usage: one in main Go doc, one in
  the program usage, and one in README.
  If we changes the flags we need to update three of them, and sometimes
  we forgot.
  To simplify, we remove the one in the Go doc main program.
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