docs: remove standalone label

[HyperLife1119]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Application (the showcase website) / infrastructure changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

In angular 19, the standalone option defaults to true, so we no longer need to emphasize that ZORRO's components are standalone or not.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.83%. Comparing base (c3ab3ba) to head (2f3b0e9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8884      +/-   ##
==========================================
- Coverage   91.84%   91.83%   -0.02%     
==========================================
  Files         548      548              
  Lines       19305    19305              
  Branches     2862     2862              
==========================================
- Hits        17730    17728       -2     
- Misses       1260     1261       +1     
- Partials      315      316       +1     

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[Laffery]

LGTM

[Laffery]

This pr had changed too many doc files, as known that a major version might have lots of changes to doc files as well.

So please note that this pr will be merged at an extremely LATE point in time and may require a rebase :)

[Laffery]

@HyperLife1119 Basically all the main features of v19 are merged, please rebase from the master and this pr is gonna to be merged