Fix displaying etcd logo in README on a dark theme

[alexandear]

This PR fixes displaying the etcd logo in README.md on a GitHub dark theme.

Before/after screenshots

Before (dark):

After (dark):

Before (light):

After (light):

See this doc for implementation details.

[k8s-ci-robot]

Hi @alexandear. Thanks for your PR.

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[ivanvc]

/ok-to-test

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 6.45161% with 29 lines in your changes missing coverage. Please review.

Project coverage is 68.63%. Comparing base (19aa0db) to head (5ecb6d6).
Report is 10 commits behind head on main.

❗ Current head 5ecb6d6 differs from pull request most recent head dd578f4

Please upload reports for the commit dd578f4 to get more accurate results.

Files with missing lines	Patch %	Lines
server/etcdmain/grpc_proxy.go	6.45%	29 Missing ⚠️

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Additional details and impacted files

Files with missing lines	Coverage Δ
server/etcdmain/grpc_proxy.go	14.52% <6.45%> (-0.53%)	⬇️

... and 28 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18891      +/-   ##
==========================================
- Coverage   68.81%   68.63%   -0.18%     
==========================================
  Files         420      420              
  Lines       35532    35558      +26     
==========================================
- Hits        24450    24406      -44     
- Misses       9658     9720      +62     
- Partials     1424     1432       +8     

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[ivanvc]

Perhaps we should standardize the white background logo with the black version from the CNCF repo? https://github.com/cncf/artwork/tree/main/projects/etcd/horizontal

But we can also keep the color one. I don't have a strong opinion.

[jmhbnz]

LGTM - Thanks @alexandear

[jmhbnz]

/test pull-etcd-integration-1-cpu-amd64

[ivanvc]

LGTM. Thanks, @alexandear.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexandear, ivanvc, jmhbnz, serathius

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