root: readme: use right contribution guide link

[dominic-r]

Follow up of https://authentiksecurity.slack.com/archives/C08MZQV91T2/p1745528523433099?thread_ts=1745528232.014619&cid=C08MZQV91T2

Details

REPLACE ME

---

Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make website)

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[dominic-r]

cc @fheisler figured you'd be interested

[netlify]

✅ Deploy Preview for authentik-docs canceled.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.70%. Comparing base (8481981) to head (b4cacff).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14250   +/-   ##
=======================================
  Coverage   92.70%   92.70%           
=======================================
  Files         809      809           
  Lines       41533    41533           
=======================================
  Hits        38504    38504           
  Misses       3029     3029           

Flag	Coverage Δ
e2e	47.77% <ø> (ø)
integration	24.39% <ø> (ø)
unit	90.57% <ø> (ø)

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[tanberry]

Thanks, much better experience for readers in the repo.