chore(zh): replace the CSS examples in translated content

[yin1999]

@bsmth has moved some CSS examples into mdn/content (The PRs could be found here). We should do some reflection here.

Please note that the examples should be localized when copying them.

Related Project: mdn/mdn#597.

zh-CN

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1. chore(zh-cn): Move CSS examples p1 - flexbox & box alignment #24473
   l10n-zh +1
2. chore(zh-cn): Move CSS examples p1 - backgrounds and borders #24504
   l10n-zh +1
3. chore(zh-cn): Move CSS examples - Cascade, specificity, and inheritance #24656
   l10n-zh +1
4. chore(zh-cn): Move CSS examples - CSS values and units #24747
   l10n-zh +1
5. chore(zh-cn): Move CSS examples - Pseudo-classes and pseudo-elements #24806
   l10n-zh +1
6. [zh-cn] update 'handling different text directions' #25095
   l10n-zh +1
7. chore(css): Move CSS examples and sync translation - Visual formatting model #25096
   l10n-zh +1

zh-TW

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1. Todo

[bsmth]

Thank you very much for the help. If you need some assistance with reviews or tooling, please reach out. It would be great to minimize the amount of manual work needed, so if you're doing something tedious, let us know as there may be good shortcuts to search & replace the macros with the examples from en-us main.