Fix broken link to contributing guide website

[bharatr21]

• closes #xxxx
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[bharatr21]

It's not broken per se, but why the unnecessary redirect?

[codecov]

Codecov Report

Merging #26369 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26369      +/-   ##
==========================================
- Coverage   91.68%   91.68%   -0.01%     
==========================================
  Files         174      174              
  Lines       50700    50700              
==========================================
- Hits        46486    46482       -4     
- Misses       4214     4218       +4

Flag	Coverage Δ
#multiple	90.18% <ø> (ø)	⬆️
#single	41.19% <ø> (-0.15%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.01% <0%> (-0.12%)	⬇️

---

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[codecov]

Codecov Report

Merging #26369 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26369      +/-   ##
==========================================
- Coverage   91.68%   91.68%   -0.01%     
==========================================
  Files         174      174              
  Lines       50700    50700              
==========================================
- Hits        46486    46482       -4     
- Misses       4214     4218       +4

Flag	Coverage Δ
#multiple	90.18% <ø> (ø)	⬆️
#single	41.19% <ø> (-0.15%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.01% <0%> (-0.12%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b48d1ff...bc84add. Read the comment docs.

[TomAugspurger]

Thanks @Bharat123rox. CI failures are being addressed in #26361.