[Whoops] Enable support for anchor elements in comment links

Whoops supports URIs in frame comments, which it converts to clickable anchor elements\*. This PR enables that feature in the custom Laravel template for the Whoops error page.

The change to the CSS makes links a lighter shade of orange, so they stand well against the dark color of the comments section.

\* `$e` (escape) will capture uris and convert them to anchor elements when the second argument is `true`.