The easiest thing would be to migrate the wiki from
Mediawiki to TiddlyWiki
While I'm a *huge* fan of TiddlyWiki, I have to advise caution here:
TiddlyWiki is a single, JavaScript-enabled HTML file, which also
contains all contents.
Due to this single-file approach, there are limits to how much content
should be put into a single TiddlyWiki file.
TiddlyWikis are measured in KB (there is no fixed max. size, but
anything above a couple of MB will probably cause problems). MediaWiki
wikis, in contrast, are usually measured in tens or hundreds of MB - way
beyond what TiddlyWiki can or should handle.
-- F.