I would like to know whether Linchpin supports the lightweight markup language ‘Markdown’?
Linchpin does not currently offer any special markdown integration.
However, there are solutions for Confluence, such as
https://marketplace.atlassian.com/plugins/org.swift.confluence.markdown/server/overview
and
https://marketplace.atlassian.com/plugins/com.atlassian.plugins.confluence.markdown.confluence-markdown-macro/server/overview