[request] Add Jackett Support + add search bar for Jackett top screen

[zilexa]

Jackett is the torrent proxy that feeds Sonarr, Radarr. Anyone not (able) to use nzb/newsfeeds relies on it. Besides adding it in Oscarr, perhaps consider a top search bar to do manual searches in Jackett. Heimdall supports this, although you cannot select Jackett as default search engine, it is available in the dropdown. Enter search string + hit Enter > new tab opens Jackett interface, and it will automatically do a manual search with the search string entered in Heimdall.

This functionality would be a great fit for Oscarr.