feat: add jupyterhub role

- add nodejs module to use npm package provider
- add jupyterhub role
- add class to configure the jupyterhub instance
- add ldap groups
- add nginx simpleproxy

site/profiles/templates/jupyterhub/jupyterhub.service.erb

@@ -0,0 +1,16 @@
+[Unit]
+Description=JupyterHub
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/opt/jupyterhub/venv/bin/jupyterhub -f /opt/jupyterhub/config.py
+WorkingDirectory=/opt/jupyterhub
+User=<%= @owner %>
+Group=<%= @group %>
+
+Environment="PATH=/opt/jupyterhub/venv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
+Restart=always
+
+[Install]
+WantedBy=multi-user.target