Serve openapi.json from the docs
Currently https://github.com/huggingface/datasets-server/blob/main/chart/static-files/openapi.json is a file in chart; every change in it should trigger a new version of the Chart. But, semantically, it does not belong to the chart and should be part of the <strike>API service</strike> docs.

Serve openapi.json from the docs: Currently https://github.com/huggingface/datasets-server/blob/main/chart/static-files/openapi.json is a file in chart; every change in it should trigger a new version of the Chart. But, semantically, it does not belong to the chart and should be part of the <strike>API service</strike> docs.
