Author: sy1234
MediaWiki:<namespace>:Sitenotice
e.g. MediaWiki:Help:Sitenotice
Implement per-namespace sitenotice functionality. For example, a sitenotice on
"Help:" would allow for a specific notification for readers of the documentation
which may not apply to the entire site.
This is much easier than inserting a template to every page in a potentially
large namespace.