[docs] link out to codesandbox from examples

[williaster]

We've gotten a lot of requests to link out to codesandbox from demo examples.

This should be pretty straight forward using their github API https://codesandbox.io/docs/importing#import-from-github

This will require refactoring each demo example to be a standalone package.

[geekplux]

Sounds good and useful for promotion, and I think tutorials(#11 ) or guides are needed if we want more users, we could provide these docs embedding codesandbox https://codesandbox.io/docs/embedding#example-embeds

[williaster]

Enumerating the examples to be ported / tracking status here cc @pedroapfilho

• Axis new(demo): Add proof-of-concept code sandbox example #642
• Areas new(vx-demo): convert Areas, StackedAreas to codesandbox #693
• BarGroup new(vx-demo): convert BarGroup, BarGroupHorizontal to codesandbox #686
• BarGroupHorizontal new(vx-demo): convert BarGroup, BarGroupHorizontal to codesandbox #686
• Bars new(vx-demo): convert Bars to codesandbox #684
• BarStack new(vx-demo): convert BarStack, HorizontalBarStack to codesandbox #685
• BarStackHorizontal new(vx-demo): convert BarStack, HorizontalBarStack to codesandbox #685
• Brush new(vx-demo): convert Brush to codesandbox #678
• Chord new(vx-demo): convert Chord to codesandbox example #669
• Dendrograms new(vx-demo): convert Dendrogram to codesandbox #690
• Dots new(vx-demo): convert Dots to codesandbox #692
• Drag-i new(demo): link Drag-i + Drag-ii examples to codesandbox #651
• Drag-ii new(demo): link Drag-i + Drag-ii examples to codesandbox #651
• Geo-Custom new(demo): link GeoMercator + GeoCustom examples to codesandbox #653
• Geo-Mercator new(demo): link GeoMercator + GeoCustom examples to codesandbox #653
• Glyphs new(demo): link Glyph + Gradient examples to codesandbox #647
• Gradients new(demo): link Glyph + Gradient examples to codesandbox #647
• Heatmap new(vx-demo): convert Heatmap to codesandbox #676
• Legends new(vx-demo): convert Legends to codesandbox example #670
• LineRadial new(demo): link Streamgraph + LineRadial examples to codesandbox #648
• Lines (now Curves) new(demo): link responsive + curves examples to codesandbox #643
• LinkTypes new(vx-demo): convert LinkTypes to codesandbox #694
• Network new(vx-demo): convert Network to codesandbox #688
• Pack new(vx-demo): convert Pack demo to codesandbox #673
• Patterns new(demo): link Pattern example to codesandbox #652
• Pies new(demo): link Pies example to codesandbox #649
• Polygons new(vx-demo): convert Polygons to codesandbox #687
• Radar new(vx-demo): convert Radar to codesandbox #677
• Responsive new(demo): link responsive + curves examples to codesandbox #643
• Stacked-Areas new(vx-demo): convert Areas, StackedAreas to codesandbox #693
• Statsplot new(vx-demo): convert Statsplot to codesandbox #674
• Streamgraph new(demo): link Streamgraph + LineRadial examples to codesandbox #648
• Threshold new(vx-demo): convert Threshold to codesandbox #683
• Treemap new(vx-demo): convert Treemap to codesandbox #682
• Trees new(vx-demo): convert Trees to codesandbox #689
• Voronoi new(vx-demo): convert Voronoi to codesandbox #671
• Zoom-i new(vx-demo): convert ZoomI to codesandbox #672