feat: jupyterhub updates

- always pull containers when starting new instance
- enable access to terminal

site/profiles/templates/jupyterhub/config.py.erb

@@ -9,6 +9,7 @@ c = get_config()
 c.JupyterHub.bind_url = 'http://:8000'
 c.JupyterHub.hub_ip = '0.0.0.0'
 c.JupyterHub.hub_port = 8081
+c.NotebookApp.enable_terminals = True
 
 # Configure the DockerSpawner
 c.JupyterHub.spawner_class = DockerSpawner
@@ -26,6 +27,7 @@ c.DockerSpawner.volumes = {
 # DockerSpawner options
 c.DockerSpawner.remove = True
 c.DockerSpawner.debug = True
+c.DockerSpawner.pull_policy = "always"
 
 # LDAP Authentication
 c.JupyterHub.authenticator_class = 'ldapauthenticator.LDAPAuthenticator'