implement creation of link on first step in backend

priv/repo/migrations/20211130021804_add_filename_to_links.exs

@@ -0,0 +1,13 @@
+defmodule Entendu.Repo.Migrations.AddFilenameToLinks do
+  use Ecto.Migration
+
+  def change do
+    alter table(:links) do
+      remove_if_exists(:content, :string)
+      add :filename, :string
+      add :filetype, :string
+      add :text_content, :string
+      add :file_content, :string
+    end
+  end
+end