feat(pastes): add raw paste handler

Signed-off-by: SphericalKat <amolele@gmail.com>

lib/ketbin/pastes/utils.ex

@@ -20,9 +20,9 @@ defmodule Ketbin.Pastes.Utils do
   def is_url?(url) do
     try do
       uri = URI.parse(url)
-      uri.scheme != nil && uri.host =~ "." && Enum.member?(["https", "http"], uri.scheme)
+      uri.scheme != nil && uri.host =~ "." && Enum.member?(["https", "http", "mailto"], uri.scheme) && !(uri.host =~ "katb.in")
     rescue
       FunctionClauseError -> false
     end
   end
-end
+end