message: fix: relative link to dataset curation README
diff: @@ -93,4 +93,4 @@ Nextclade team hosts a public file server containing all the dataset file themse
  ## Dataset updates
  -Maintainers add and update the datasets periodically. The dataset curation procedure is described in the [Dataset curation guide](packages/datasets/README.md).
  +Maintainers add and update the datasets periodically. The dataset curation procedure is described in the [Dataset curation guide](../../packages/datasets/README.md).
  