always include title, manifest and favicon

lib/pleroma/web/fallback/redirect_controller.ex

@@ -18,9 +18,22 @@ defmodule Pleroma.Web.Fallback.RedirectController do
   end
 
   def redirector(conn, _params, code \\ 200) do
+    {:ok, index_content} = File.read(index_file_path())
+
+    title = "<title>#{Pleroma.Config.get([:instance, :name])}</title>"
+    favicon = "<link rel='icon' href='#{Pleroma.Config.get([:instance, :favicon])}'>"
+    manifest = "<link rel='manifest' href='/manifest.json'>"
+
+    response =
+      index_content
+      |> String.replace(
+        "<!--server-generated-meta-->",
+        title <> favicon <> manifest
+      )
+
     conn
     |> put_resp_content_type("text/html")
-    |> send_file(code, index_file_path())
+    |> send_resp(200, response)
   end
 
   def redirector_with_meta(conn, %{"maybe_nickname_or_id" => maybe_nickname_or_id} = params) do