fix some sphinx warnings

Author: bollwyvl

docs/source/conf.py

@@ -46,7 +46,6 @@ def setup(app):
 
 extensions = [
     'myst_nb',
-    'sphinx.ext.autosectionlabel',
     'sphinx.ext.autodoc',
     'sphinx.ext.autosummary',
     'sphinx.ext.intersphinx',

docs/source/examples/Layout Templates.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "# Using Layout Templates\n",
     "\n",
-    "As we showed in [Layout of Jupyter widgets](Widget%20Layout.ipynb), multiple widgets can be arranged together using the flexible [GridBox](Widget%20Styling.ipynb#The-Grid-layout) specification. However, use of the specification involves some understanding of CSS properties and may impose sharp learning curve. Here, we will describe layout templates built on top of `GridBox` that simplify creation of common widget layouts."
+    "As we showed in [Layout of Jupyter widgets](Widget%20Layout.ipynb), multiple widgets can be arranged together using the flexible [GridBox](Widget%20Layout.ipynb#The-Grid-layout) specification. However, use of the specification involves some understanding of CSS properties and may impose sharp learning curve. Here, we will describe layout templates built on top of `GridBox` that simplify creation of common widget layouts."
    ]
   },
   {