Hey there, Bootstrap only handles the presentation layer. With no cms, and no custom back end code, you still have some options 
Fortunately you are not the first person with this need. Here are some options (Google free):
https://www.fusionbot.com/Default.htm
Pico Search was good but is not available now.
As far as I know these are the best options short of switching to a cms or putting something on your own server. Hope that helps!