Max DeKock

This PR adds a `syncPolicy` callback to the repo configuration. It will be called whenever a sync message is received from a peer, and if it returns false, syncing will...

[Docs]: description of relative link behavior is incorrect for index routes

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### Describe what's incorrect/missing in the documentation In the[ Link documentation](https://reactrouter.com/en/main/components/link#relative), relative paths are explained thusly: > By default, links are relative to the route hierarchy (`relative="route"`), so `..` will...