Fix sitemap kudos url

[octavioamu]

Description

Fixed sitemap kudos url to be relative, since actually the urls are wrong.

Refers/Fixes

Testing

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@8e47405). Click here to learn what that means.
The diff coverage is 33.33%.

@@            Coverage Diff            @@
##             master    #4855   +/-   ##
=========================================
  Coverage          ?   30.44%           
=========================================
  Files             ?      216           
  Lines             ?    17335           
  Branches          ?     2353           
=========================================
  Hits              ?     5277           
  Misses            ?    11849           
  Partials          ?      209

Impacted Files	Coverage Δ
app/app/sitemaps.py	62.12% <0%> (ø)
app/kudos/models.py	54.7% <50%> (ø)

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