fix: resolve config directory relative to flat output file structure

[jacob-ebey]

Build output is bundled now so things are collapsed to the root of the dist directory. We now need to resolve the config dir relative to the root, not the input file structure.

[changeset-bot]

🦋 Changeset detected

Latest commit: 7284a3d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 10 packages

Name	Type
@react-router/dev	Patch
@react-router/fs-routes	Patch
@react-router/remix-config-routes-adapter	Patch
react-router	Patch
react-router-dom	Patch
@react-router/architect	Patch
@react-router/cloudflare	Patch
@react-router/express	Patch
@react-router/node	Patch
@react-router/serve	Patch

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