doc: retire goreport card badge

[fredbi]

This nice yet simple quality report is now discontinued. Retire the deprecated badge.

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.48%. Comparing base (8a121e7) to head (37ab399).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage   91.46%   91.48%   +0.02%     
==========================================
  Files         103      103              
  Lines       12875    12875              
==========================================
+ Hits        11776    11779       +3     
+ Misses        851      849       -2     
+ Partials      248      247       -1     

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