Move Ponos server-side code to Arkindex app

arkindex/ponos/__init__.py

arkindex/ponos/admin.py

arkindex/ponos/api.py

arkindex/ponos/apps.py

arkindex/ponos/authentication.py

arkindex/ponos/aws.py

arkindex/ponos/fields.py

arkindex/ponos/forms.py

arkindex/ponos/helpers.py

arkindex/ponos/keys.py

arkindex/ponos/management/__init__.py

arkindex/ponos/management/commands/__init__.py

arkindex/ponos/management/commands/generate_private_key.py

arkindex/ponos/managers.py

arkindex/ponos/migrations/0001_initial.py

arkindex/ponos/migrations/0002_recipe_validator.py

arkindex/ponos/migrations/0003_no_empty_slugs.py

arkindex/ponos/migrations/0004_agent.py

arkindex/ponos/migrations/0005_gpu_names_blank.py

arkindex/ponos/migrations/0006_add_parents.py