website/docs: integrations: gitea: specify callback url

[dominic-r]

closes #10179

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[dominic-r]

I'll keep the style changes for my other PR if you don't mind. Just to keep things together

[dominic-r]

cc @tanberry

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.62%. Comparing base (e6fd7cc) to head (ce9a152).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10180      +/-   ##
==========================================
- Coverage   92.62%   92.62%   -0.01%     
==========================================
  Files         712      712              
  Lines       34933    34933              
==========================================
- Hits        32356    32355       -1     
- Misses       2577     2578       +1     

Flag	Coverage Δ
e2e	49.56% <ø> (+<0.01%)	:arrow_up:
integration	25.40% <ø> (ø)
unit	90.09% <ø> (+<0.01%)	:arrow_up:

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