fix links to sbi-dev website.

[janfb]

closes #914

[michaeldeistler]

Thanks!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (06547ba) 75.46% compared to head (f65f243) 75.46%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #915   +/-   ##
=======================================
  Coverage   75.46%   75.46%           
=======================================
  Files          80       80           
  Lines        6284     6284           
=======================================
  Hits         4742     4742           
  Misses       1542     1542           

Flag	Coverage Δ
unittests	75.46% <ø> (ø)

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