Add notebooks to docs

Author: keller-mark

docs/widget_examples.rst

@@ -5,9 +5,22 @@ Widget examples
    :maxdepth: 2
 
    notebooks/widget_brain
+   notebooks/widget_brain_h5ad
+   notebooks/widget_brain_with_base_dir
+   notebooks/web_app_brain
    notebooks/widget_genomic_profiles
    notebooks/widget_imaging
+   notebooks/widget_segmentations_beta
    notebooks/widget_pbmc
+   notebooks/widget_pbmc_remote
+   notebooks/spatial_data
+   notebooks/spatial_data_blobs
+   notebooks/spatial_data_mouseliver
+   notebooks/spatial_data_mouseliver_remote
    notebooks/widget_loom
    notebooks/widget_from_dict
-   notebooks/widget_pbmc_remote.ipynb
+   notebooks/widget_modify_config
+   notebooks/widget_plugin_demo
+   notebooks/widget_plugin_custom
+   notebooks/widget_plugin_spatial-query
+   notebooks/page_mode_example