docs: datasets tutorials and quickstart (#3734)

* docs: datasets tutorials and quickstart

* fixes

* remove

* Update docs/datasets-and-experiments/use-cases-datasets/text2sql.md

Co-authored-by: Xander Song <axiomofjoy@gmail.com>

* Update docs/datasets-and-experiments/quickstart-datasets.md

Co-authored-by: Xander Song <axiomofjoy@gmail.com>

* Update docs/datasets-and-experiments/use-cases-datasets/summarization.md

Co-authored-by: Xander Song <axiomofjoy@gmail.com>

* Update docs/datasets-and-experiments/quickstart-datasets.md

* Update docs/datasets-and-experiments/use-cases-datasets/summarization.md

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Co-authored-by: Xander Song <axiomofjoy@gmail.com>