add fallbacks to imported JS in examples

Author: rmorshea

Diff for: docs/source/examples/primary_secondary_buttons.py

@@ -1,7 +1,7 @@
 import idom
 
 semantic_ui = idom.Module("semantic-ui-react")
-Button = semantic_ui.Import("Button")
+Button = semantic_ui.Import("Button", fallback="loading...")
 
 semantic_ui_style = idom.html.link(
     {

Diff for: docs/source/examples/simple_dashboard.py

@@ -6,7 +6,7 @@
 from idom.widgets.html import Input
 
 
-VictoryLine = idom.Module("victory").Import("VictoryLine")
+VictoryLine = idom.Module("victory").Import("VictoryLine", fallback="loading...")
 
 
 @idom.element

Diff for: docs/source/examples/victory_chart.py

@@ -2,6 +2,6 @@
 
 victory = idom.Module("victory")
 
-VictoryBar = victory.Import("VictoryBar")
+VictoryBar = victory.Import("VictoryBar", fallback="loading...")
 
 display(VictoryBar, {"style": {"parent": {"width": "500px"}}})