[admin] fix docs links in README

[ccarruitero]

Summary

Fix links in admin README

Checklist

Check out our PR guidelines for more details.

The following are mandatory for all PRs:

• I have written a thorough PR description.
• I have kept my commits small and atomic.
• I have used clear, explanatory commit messages.

The following are not always needed:

• 📖 I have updated the README to account for my changes.
• 📑 I have documented new code with YARD.
• 🛣️ I have opened a PR to update the guides.
• ✅ I have added automated tests to cover my changes.
• 📸 I have attached screenshots to demo visual changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.92%. Comparing base (9997bce) to head (96c7886).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5703   +/-   ##
=======================================
  Coverage   88.92%   88.92%           
=======================================
  Files         700      700           
  Lines       16655    16655           
=======================================
  Hits        14810    14810           
  Misses       1845     1845           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[tvdeyen]

Thanks