Revert "Merge branch 'features/hashtag-column' into 'develop'"

This reverts merge request !2824

lib/pleroma/activity/ir/topics.ex

@@ -48,12 +48,14 @@ defmodule Pleroma.Activity.Ir.Topics do
     tags
   end
 
-  defp hashtags_to_topics(object) do
-    object
-    |> Object.hashtags()
+  defp hashtags_to_topics(%{data: %{"tag" => tags}}) do
+    tags
+    |> Enum.filter(&is_bitstring(&1))
     |> Enum.map(fn tag -> "hashtag:" <> tag end)
   end
 
+  defp hashtags_to_topics(_), do: []
+
   defp remote_topics(%{local: true}), do: []
 
   defp remote_topics(%{actor: actor}) when is_binary(actor),