Move notebooks 03 and 04 to folder

Author: mwcraig

notebooks/03.00-Widget_Basics.ipynb renamed to notebooks/03.Basics/03.00-Widget_Basics.ipynb

@@ -116,7 +116,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# %load solutions/interact-basic-list/bounded-float-text.py"
+    "# %load solutions/bounded-float-text.py"
    ]
   },
   {

notebooks/04.00-widget-list.ipynb renamed to notebooks/04.WidgetList/04.00-widget-list.ipynb

@@ -322,7 +322,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# %load solutions/output/sidecar-triple.py"
+    "# %load solutions/sidecar-triple.py"
    ]
   },
   {