[WIP] Configure kiwix to not display a searchbar and let ideascube handle it.

[mgautierfr]

This PR correspond to the 590 one on ideascube ideascube/ideascube#590

[fheslouin]

How far are we from using this new feature ?

[mgautierfr]

This is a bit on hold :/

It have been a lot of change on the kiwix side that somehow impact this feature:

• We have rewritten all the build system of kiwix. (Split code in several repositories, add new master script to build everything, handle cross-compilation, ...) This works well but there is one missing feature for BSF : cross-compilation to ARM. Almost everything is in place (cross-compilation system with use of external toolschain) but the last step (use a toolchain for arm) is missing. This is not a priority on kiwix side (sadly for BSF). I could spend a day (at most) to add it. Without it we stick with a old version of kiwix-serve with which we cannot change the topbar.
• There is a parallel work being made on the css/js for mobile. This work is in two parts : improve how we scrap wikimedia and create the zim; and rewrite the html/css of kiwix-serve to provide better responsive design. So we will rewrite the toolbar code on the kiwix side. And more than just the toolbar, we will probably update how kiwix-serve serves it.

For all of this, I think it is preferable to wait a bit for more improvement on kiwix side.
I've just open a bug on kiwix-tools for this need (kiwix/kiwix-tools#17)