fix #394 :

- Add a mutable navigationOptions member to PuppeteerSharpRendererOptions
- Enables setting `Timeout` on that object, note that large charts may take extremely long to render

src/Plotly.NET.ImageExport/PuppeteerSharpRenderer.fs

@@ -20,6 +20,7 @@ module PuppeteerSharpRendererOptions =
  let mutable localBrowserExecutablePath =
  None
 
+ let mutable navigationOptions = NavigationOptions()
 
 type PuppeteerSharpRenderer() =
 
@@ -68,7 +69,12 @@ type PuppeteerSharpRenderer() =
  let! page = browser.NewPageAsync() |> Async.AwaitTask
 
  try
- let! _ = page.SetContentAsync(patchHtml width height scale format html) |> Async.AwaitTask
+ let! _ = 
+ page.SetContentAsync(
+ html = patchHtml width height scale format html,
+ options = PuppeteerSharpRendererOptions.navigationOptions
+ ) 
+ |> Async.AwaitTask
  let! imgHandle = page.WaitForExpressionAsync("window.plotlyImage") |> Async.AwaitTask
  let! imgStr = imgHandle.JsonValueAsync<string>() |> Async.AwaitTask
  return imgStr