Wikisource

Triggers: !wikisource, !ws

Try it

Kagi would openhttps://en.wikisource.org/w/index.php?search=protein+folding&title=Special:Search&go=Go

Run !wikisource in Kagi

URL pattern: https://en.wikisource.org/w/index.php?search=query&title=Special:Search&go=Go

Searches en.wikisource.org, filed under Academic.