Design and provide a reasonable access to books when Javascript is disabled

[benoit74]

With the move to Vue.JS, scraper will make JS an even more mandatory requirement.

We need to implement a fallback UI for situations where JS is disabled. UI does not need to be fancy at all (we accept we need Javascript for that) but should provide a reasonable listing of all books in the ZIM, and direct access to their various formats.

It is important title search and full text search also continue to work even with Javascript disabled.

[kelson42]

nojs features are only a nice-to-have.