Fix getting-started-tour external link steps
Created by: erzhtor
Looks like external links in "getting started tour" were broken in https://github.com/sourcegraph/sourcegraph/pull/30534.
Screenshots
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Test plan
sg start dotcom- Open https://sourcegraph.com/search?feature-flag-key=getting-started-tour&feature-flag-value=true
- Chech last 2 steps/link in getting started tour are working correctly