[Launchpad] Favicon is not showing up

[fvsch]

There's some code and config for showing a favicon in the Launchpad page, but in practice it doesn't seem to work.

When running devtools-launchpad with yarn start, I'm getting this HTML:

<link rel="shortcut icon" href="launchpad-favicon.png" type="image/png" />

But that image seems to be accessible at /pad-assets/launchpad-favicon.png instead.

When running debugger.html with yarn start, I'm getting this HTML:

<link rel="shortcut icon" href="favicon.png" type="image/png" />

But that image seems to be accessible at /images/favicon.png.