Fix the format and translation of Chinese markdown

[cotes2020]

What has been changed:

• fix Chinese and English mixed formatting
• fix bold/heading syntax error
• improved translation of word bus factor in "so-whats-next.md"
• added internal translation links

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Most of them are fixed by lint tool, and the remaining parts that cannot be detected are fixed manually. Although it cannot be guaranteed to be 100% perfect, it has significantly improved the reading experience compared to the original version.

[cotes2020]

As an additional suggestion, should a multilingual translation link be added to the EN markdown docs, pointing to other multilingual versions of markdown docs?

For instance, add the following to the head of file docs/2023-02-14-so-whats-next.md:

Translations: [zh_CN](docs/zh_CN/2023-02-14-so-whats-next.md.md)

[zloirock]

Yep, that makes sense.

[cotes2020]

OK, will do

[santi100a]

@zloirock, consider merging this pull request, it is green.