suggest to add single tab to show the example dataset like baskteball

[nianiaJR]

Detail suggestions:

1. Add a single menu tab to show the example dataset, which help new users quickly find the example data.
2. Beside the basketball-player dataset, we can enrich other common dataset such as social network, bank transfer

[wey-gu]

some input

• add some usable datasets(from different sources) in the learning path or other page #1388 (listed months ago, with livejournal, etc.)
• https://github.com/wey-gu/covid-track-graph-datagen (covid dummy graph)
• https://github.com/wey-gu/fraud-detection-datagen (fraud detection)

[whitewum]

1. Sure
2. basketball-player is almost the same as the UT cases in nebula Core. It depends on the Nebula Core