castle-search: read Google results again by resolving its /goto links

Google now wraps every result as google.com/goto?url=<opaque token>. The
self-host filter discarded all of them, so every Google search failed with
'nothing could be parsed'. Accept /goto, resolve it node-side from the
302 Location, and when Google answers its 'Verifying your request'
interstitial instead, keep the wrapped link and put the displayed
breadcrumb in the snippet.

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