Remove Huntarr

The repository, subreddit, and Discord have all been deleted or privated.

Also: https://www.reddit.com/r/selfhosted/comments/1rckopd/huntarr_your_passwords_and_your_entire_arr_stacks/

Author: BrenekH

arr-services.json

@@ -243,11 +243,6 @@
 			"description": "Extracts archives from watch folders for import into other ARR apps",
 			"github_slug": "davidnewhall/unpackerr"
 		},
-		{
-			"name": "Huntarr",
-			"description": "Watches media libraries and searches for missing content and quality upgrades in Sonarr, Radarr, and Lidarr",
-			"github_slug": "plexguide/Huntarr.io"
-		},
 		{
 			"name": "Cleanuparr",
 			"description": "Tool for automating cleanup of unwanted or blocked files in *arr applications.",