fix: check experimental flag when using the rewrite function

[ematipico]

Changes

Closes withastro/docs#8660

Testing

Manually tested

Docs

N/A

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[florian-lefebvre]

Looks good but since it's duplicated, couldn't it be extracted to a shared function?

[ematipico]

Looks good but since it's duplicated, couldn't it be extracted to a shared function?

Definitely, but I'd prefer to do it in another to reduce the changes.

[bluwy]

Same thoughts as Florian too, and perhaps if it can do a

if (!this.pipeline.manifest.rewritingEnabled) {
  /// log error
  return
}

To prevent the indentation here and when we stabilize the feature, but not a huge blocker.