Fix broken links flagged by urlchecker

Replace the dead plotly chart-studio image embed in README with a
locally rendered PNG of the actual surface plot code shown above it,
and repoint the NEWS webinar link at a Wayback Machine snapshot since
the live page is gone.

Author: cpsievert

NEWS.md

@@ -252,7 +252,7 @@ This is minor patch release with a few minor bug fixes and updates test expectat
 
 ## NEW FEATURES & IMPROVEMENTS
 
-* Several new features and improvements related to accessing plotly.js events in shiny (learn more about them in this RStudio [webinar](https://posit.co/resources/videos/accessing-and-responding-to-plotly-events-in-shiny/)):
+* Several new features and improvements related to accessing plotly.js events in shiny (learn more about them in this RStudio [webinar](https://web.archive.org/web/20230130014528/https://www.rstudio.com/resources/webinars/accessing-and-responding-to-plotly-events-in-shiny/)):
     * The `event` argument of the `event_data()` function now supports the following events: `plotly_selecting`, `plotly_brushed`, `plotly_brushing`, `plotly_restyle`, `plotly_legendclick`, `plotly_legenddoubleclick`, `plotly_clickannotation`, `plotly_afterplot`, `plotly_doubleclick`, `plotly_deselect`, `plotly_unhover`. For examples, see `plotly_example("shiny", "event_data")`, `plotly_example("shiny", "event_data_legends")`, and  `plotly_example("shiny", "event_data_annotation")`, 
     * New `event_register()` and `event_unregister()` functions for declaring which events to transmit over the wire (i.e., from the browser to the shiny server). Events that are likely to have large overhead are not registered by default, so you'll need to register these: `plotly_selecting`, `plotly_unhover`, `plotly_restyle`, `plotly_legendclick`, and `plotly_legenddoubleclick`.
     * A new `priority` argument. By setting `priority='event'`, the `event` is treated like a true event: any reactive expression using the `event` becomes invalidated (regardless of whether the input values has changed). For an example, see `plotly_example("shiny", "event_priority")`.

README.md

@@ -100,7 +100,7 @@ ggplot2 API won’t ever support (e.g., surface,
 plot_ly(z = ~volcano, type = "surface")
 ```
 
-![<https://plotly.com/~brnvg/1134>](https://plotly.com/~brnvg/1134.png)
+<img src="man/figures/README-volcano-surface.png" width="600" />
 
 ## Learn more