Search hardcoded to Annas Archive

[C0ntroller]

While you can set mirrors for Annas Archive, libgen and zlib you won't be able to search other sites than Annas Archive because of this hardcoded search string:

KindleFetch/kindlefetch/bin/search.sh

Line 88 in 3e342db

local search_url="$ANNAS_URL/search?page=${page}&q=${encoded_query}${filters}"

It would be great to be able to search on the other two sites as well. Maybe just a toggle in the search settings?