This is a nice intention and would be great for security. It works fine for displaying opening hours and upcoming events, etc. However, as soon as you want to search for books, or you want some log in feature to see which books you have loaned out and when they need to be returned, it's clear that a purely static site just doesn't cut it for today's expectations.
A static site does not have any backend, thus cannot provide you with search results because it cannot do any computing at all (just provide you the same (static) content again and again).
You can go around these by having some presets in the profile and providing cached results for the most common search types but this is more or less as far as you can go.
I can change the values of the presets I can add headers, remove headers change the value of cookies, add cookies, remove cookies etc etc.
Most people don't need overly complex searches...