dataset-viewer

25b80c6a - rework doc (#566)

rework doc (#566) * docs: ✏️ fix order of the pages * docs: ✏️ rewrite the intro and /valid pages * docs: ✏️ fix the snippet * docs: ✏️ fix the doc * docs: ✏️ format * docs: ✏️ format * docs: ✏️ update content * docs: ✏️ format