Sample app markdown doc rendering issues

[michael-hawker]

Known Issues:

• Markdown Table in Attached Shadow Overview doesn't render
• DocFX call outs don't render nice

Hoping we can just swap to the new control from Labs - CommunityToolkit/Labs-Windows#480
And then just add any missing features for rendering on top of that instead.

[michael-hawker]

Also CameraPreview sample doesn't stop using camera when navigating away. Not sure if that's a sample page issue or a problem with the control, but we'll have to fix it later. Probably its own bug? Considering it doesn't work due to Windows App SDK bug, it's probably not a high priority? But still going to be an issue.

[itsWindows11]

Are warnings/notes intended to be displayed like this?

GIFs not displaying:

Malformed links which are supposed to work?

[itsWindows11]

Also it seems to take a few secs to load any sample for the first time after launching the app?