feat: How to deal with the repo items without any label inside of index.yml files?

[birdflyi]

Agree with the opinion: the index.yml files in labeled_data should only have labels.

Disscusstion Referenced:

• https://github.com/X-lab2017/open-digger/pull/1487#discussion_r1448366736
• https://github.com/X-lab2017/open-digger/pull/1487#discussion_r1448368773

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          Are all the repos below can not be assigned to any above categories? I think they should be set to above categories since there is an `other` sub field.

I think the best way to do this is that Application should only have labels, all the orgs or repos should be in sub labels.

_Originally posted by @frank-zsy in https://github.com/X-lab2017/open-digger/pull/1487#discussion_r1448366736_

[open-digger-bot[bot]]

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