Merge pull request #3800 from 2i2c-org/hhmi_spyglass_default_url

hhmi/spyglass: set default URL to pull spyglass demo notebooks

Author: jmunroe

config/clusters/hhmi/spyglass.values.yaml

@@ -62,7 +62,7 @@ jupyterhub:
           mountPath: /home/jovyan/shared-readonly
           subPath: _shared
           readOnly: true
-    defaultUrl: /lab
+    defaultUrl: /git-pull?repo=https%3A%2F%2Fgithub.com%2FLorenFrankLab%2Fspyglass-demo&urlpath=lab%2Ftree%2Fspyglass-demo%2Fnotebooks%2F00_HubQuickStart.ipynb&branch=main
     image:
       name: quay.io/lorenlab/hhmi-spyglass-image
       tag: "cb5d6847727d"