add back in toc

_toc.yml

@@ -0,0 +1,19 @@
+format: jb-book
+root: README
+parts:
+  - caption: Preamble
+    chapters:
+      - file: notebooks/how-to-cite
+  - caption: Foundations
+    chapters:
+      - file: notebooks/foundations/intake-esm
+      - file: notebooks/foundations/google-cloud-basic
+      - file: notebooks/foundations/esgf-opendap
+  - caption: Example workflows
+    chapters:
+      - file: notebooks/example-workflows/ecs-cmip6
+      - file: notebooks/example-workflows/enso-esgf
+      - file: notebooks/example-workflows/gmst
+      - file: notebooks/example-workflows/precip-freq
+      - file: notebooks/example-workflows/xesmf-ohu
+      - file: notebooks/example-workflows/esgf2-arm-comparison