Fix assets

Author: Noarkhh

mix.exs

@@ -62,6 +62,16 @@ defmodule Membrane.Mixfile do
       extras: extras(),
       formatters: ["html"],
       source_ref: @source_ref,
+      assets: %{
+        "guides/membrane_tutorials/get_started_with_membrane/assets" => "assets",
+        "guides/membrane_tutorials/basic_pipeline/assets" => "assets",
+        "guides/membrane_tutorials/basic_pipeline_extension/assets" => "assets",
+        "guides/membrane_tutorials/create_new_plugin/assets" => "assets",
+        "guides/membrane_tutorials/digital_video_introduction/assets" => "assets",
+        "guides/membrane_tutorials/h264/assets" => "assets",
+        "guides/membrane_tutorials/broadcasting/assets" => "assets",
+        "guides/membrane_tutorials/glossary/assets" => "assets"
+      },
       nest_modules_by_prefix: [
         Membrane.Bin,
         Membrane.Element,