[FIX] Update BIDS Starter Kit links

[markmikkelsen]

Changed the BIDS Starter Kit website and tutorials URLs in mkdocs.yml to point to bids.neuroimaging.io instead of bids-standard.github.io.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.71%. Comparing base (7d79e1f) to head (313ed42).
⚠️ Report is 59 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2201   +/-   ##
=======================================
  Coverage   82.71%   82.71%           
=======================================
  Files          20       20           
  Lines        1608     1608           
=======================================
  Hits         1330     1330           
  Misses        278      278           

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