www_coderepo: rescan cgit project-list for new coderepos

Coderepo changes are probably more common than inbox changes, so
it probably makes sense to rescan and look for new coderepos on
404s, especially since we serve mirrored manifest.js.gz as-is.

I noticed my git.kernel.org mirror was serving manifest.js.gz
pointing to irretrievable repositories.  This should stop that.

We'll also drop the underscore ('_') and use `coderepo'
everywhere to be consistent with our documentation.

We may serve new inboxes in a similar way down the line, too;
but this change only affects coderepos for now since we can
guarantee the inbox manifest.js.gz never contains irretrievable
inboxes as it's dynamically generated.

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