[fix #408] remove aio from files that need to be initialized

Author: fmichonneau

bin/lesson_initialize.py

@@ -19,7 +19,6 @@
     '_extras/discuss.md',
     '_extras/figures.md',
     '_extras/guide.md',
-    'aio.md',
     'index.md',
     'reference.md',
     'setup.md',