In the past, it was possible (with effort) to make a site searchable with Google's custom site search (CSE):
Is this still possible? The links from that site are gone.
And, more importantly, is it possible to make the site searchable through a global search site like Google or Duck Duck Go?
I poked around with adding a site to Google, but Canvas's HTML editor strips out the permission to search tags that Google requests be embedded within a site.