More efficient query for /ideas?filter[title][like]=keyword1,keyword2,...

@agatatalita wrote about this:

> Arango supports word-based prefix matching from what I got on slack(this has probably some index support). If we want something different we can explore it later.
>
> ```
> FOR idea IN FULLTEXT(ideas, "title", CONCAT("prefix:", CONCAT_SEPARATOR(",|prefix:", @Keywords)))
> RETURN idea
> ```