Suggest waiting if repository is fairly new

[jsoref]

Steps

1. Load https://cs.github.com/check-spelling/bats-core

Actual results

Doesn't look like check-spelling/bats-core is a known repository. Search all repos instead?
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Expected results

Additional advice noting:

• If the repository is new, it might take up to time window to be indexed.
• If the repository is a fork, you might be able to search its upstream while you wait for it to be indexed.

Ideally cs should be able to know if a repository is "new" and thus conditionally show the first point. And similarly, it should know if a repository is a "fork" of an indexed repository and thus be able to conditionally show the second item.