docs: new logo replacement

[vthinkxie]

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?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[wzhudev]

@vthinkxie icon 的命名空间 demo 那里还有一个小 logo

[netlify]

Deploy preview for ng-zorro-master ready!

Built with commit 87c7fc8

https://deploy-preview-2910--ng-zorro-master.netlify.com

[vthinkxie]

@vthinkxie icon 的命名空间 demo 那里还有一个小 logo

done

[codecov]

Codecov Report

Merging #2910 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2910   +/-   ##
=======================================
  Coverage   97.36%   97.36%           
=======================================
  Files         526      526           
  Lines       11037    11037           
  Branches      786      786           
=======================================
  Hits        10746    10746           
  Misses        190      190           
  Partials      101      101

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[wzhudev]

Hooray. New logo.