formatter: Stop using phoenix HTML and format it ourselves

* Pheonix has an extra scheme whitelist conflicting with ours
* Pheonix doesn’t seems to do URL encoding, just HTML encoding

Closes: https://git.pleroma.social/pleroma/pleroma/issues/307

lib/pleroma/formatter.ex

@@ -222,13 +222,7 @@ defmodule Pleroma.Formatter do
     subs =
       subs ++
         Enum.map(links, fn {uuid, url} ->
-          {:safe, link} = Phoenix.HTML.Link.link(url, to: url)
-
-          link =
-            link
-            |> IO.iodata_to_binary()
-
-          {uuid, link}
+          {uuid, "<a href=\"#{url}\">#{url}</a>"}
         end)
 
     {subs, uuid_text}