Move jupyterhub_config.py inside the package

This is where it's referred to from the systemd package

tljh/jupyterhub_config.py

@@ -0,0 +1,26 @@
+"""
+JupyterHub config for the littlest jupyterhub.
+
+This is run on startup & restarts. This file has the following
+responsibilities:
+
+1. Set up & maintain user conda environment
+2. Configure JupyterHub from YAML file
+
+This code will run as an unprivileged user, but with unlimited
+sudo access. Code here can block, since it all runs before JupyterHub
+starts.
+"""
+from tljh import conda
+import os
+
+INSTALL_PREFIX = os.environ.get('TLJH_INSTALL_PREFIX', '/opt/tljh')
+USER_ENV_PREFIX = os.path.join(INSTALL_PREFIX, 'user')
+
+c.JupyterHub.spawner_class = 'systemdspawner.SystemdSpawner'
+c.JupyterHub.authenticator_class = 'dummyauthenticator.DummyAuthenticator'
+
+c.SystemdSpawner.extra_paths = [os.path.join(USER_ENV_PREFIX, 'bin')]
+c.SystemdSpawner.use_sudo = True
+
+c.SystemdSpawner.dynamic_users = True