Fix broken documentation link

[futreall]

Fix broken documentation links

• Replaced https://github.com/farcasterxyz/hub-monorepo/tree/main/apps/replicator
  with https://github.com/farcasterxyz/hub-monorepo/tree/main/packages/shuttle.

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PR-Codex overview

This PR updates the documentation for the Replicator tool in the apps.md file, changing the link to point to a new location.

Detailed summary

• Updated the link for Replicator from ../../hubble/hubble.md to https://github.com/farcasterxyz/hub-monorepo/tree/main/packages/shuttle.

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