[Feature] Search multiple sites instead of 1

[KraXen72]

when searching, make search query to not 1 but a selected few extensions (user can pick more instead of one in the hamburger menu where they now pick 1 source) and display them one under the other, like you display them in the homepage

problem:

when user searches for anime/manga and it isn't in the first searched source, user is just going to switch source and search there.
this would take less time

hamburger menu:

i'd say user could pick up to 3 ?
that way you don't make too many requests but also get more than 1 source search results

search results:

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