docs: update contributing link and pub date

[luc99hen]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes # #2264

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[luc99hen]

@rambohe-ch @zyjhtangtang PTAL

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.18%. Comparing base (253f430) to head (9083070).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2265      +/-   ##
==========================================
- Coverage   45.18%   45.18%   -0.01%     
==========================================
  Files         422      422              
  Lines       28779    28779              
==========================================
- Hits        13005    13004       -1     
- Misses      14460    14462       +2     
+ Partials     1314     1313       -1     

Flag	Coverage Δ
unittests	45.18% <ø> (-0.01%)	⬇️

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[rambohe-ch]

/LGTM