Remove Sourcegraph plugin

We are removing this plugin as we significantly improve it. See 404 at https://github.com/sourcegraph/sourcegraph-sublime.

repository/s.json

@@ -1990,17 +1990,6 @@
 				}
 			]
 		},
-		{
-			"name": "Sourcegraph",
-			"details": "https://github.com/sourcegraph/sourcegraph-sublime",
-			"donate": null,
-			"releases": [
-				{
-					"sublime_text": "*",
-					"tags": true
-				}
-			]
-		},
 		{
 			"name": "SourcePawn Syntax Highlighting",
 			"details": "https://github.com/Dillonb/SublimeSourcePawn",