Related to #2328 : After moving cactuscode.org to einsteintookit.org , the 404 file not found error should be updated so that users are made aware of where the documentation (and any other content to cactuscode.org) has been moved.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2329/update-einsteintoolkitorg-404-error