Support Xapian title index (via libzim) - aka "suggestions"

[Jaifroid]

We currently support Xapian fulltext index via libzim, but we are not supporting search of the title index due to lack of bindings in the libzim WASM.

[charanbhatia]

hi, can you please assign this issue to me. I want to work on this.

[Jaifroid]

@charanbhatia This isn't a trivial issue, and it actually involves creating bindings between C++ and JavaScript, then compiling with Emscripten. If you have experience with that, then by all means, but I actually can't provide any guidance on it, as it's low-level stuff.