move demo back to plugin and add example

[ikiwiki] / underlays / basewiki / subpage.mdwn

[[!meta redir=ikiwiki/subpage delay=10]]
[[!meta robots="noindex, follow"]]

This page has moved to [[ikiwiki/subpage|ikiwiki/subpage]]. Please update your
links, as this redirection page will be removed in a future ikiwiki
release.