Add Toggl data to attendances, fix attendance creation for past lectures. Change styling a little.

db/migrate/20231002150348_add_toggl_data_to_attendance.rb

@@ -0,0 +1,5 @@
+class AddTogglDataToAttendance < ActiveRecord::Migration[7.0]
+  def change
+    add_column :attendances, :toggl_data, :jsonb
+  end
+end