Add a note for people needing 0.18 docs

Author: evancz

src/frontend/Page/Search.elm

@@ -131,8 +131,15 @@ viewSearch query entries =
             results =
               List.map viewEntry (Entry.search query es)
           in
-          Keyed.node "div" [] <|
-            ("h", viewHint (List.isEmpty results) query) :: results
+          div []
+            [ Keyed.node "div" [] <|
+                ("h", viewHint (List.isEmpty results) query) :: results
+            , p [ class "pkg-hint" ]
+                [ text "Need documentation for a 0.18 package? Read "
+                , a [ href "https://gist.github.com/evancz/9031e37902dfaec250a08a7aa6e17b10" ] [ text "this" ]
+                , text " for help finding it."
+                ]
+            ]
     ]