Support line separator (<hr>) in asciidoctor-parser-doxia-module

[abelsromero]

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What is this issue about?

• Bug report 🪲
• Feature request 🏎
• Question ❓ Consider dropping it first in the Project Chat

Description

As show in Doxia Fluido sample https://maven.apache.org/skins/maven-fluido-skin/sample.html.
We should be able to add support for AsciiDoc separator ---.