Verwijder de niet langer gebruikte nHR 2 en 2.5 XSL's

[mprins]

Er is alleen ondersteuning voor v3.0 van 2015

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37%. Comparing base (37134ae) to head (808c2f0).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##             master   #2524   +/-   ##
========================================
- Coverage        37%     37%   -0%     
  Complexity       74      74           
========================================
  Files           199     199           
  Lines         13551   13551           
  Branches       1431    1431           
========================================
- Hits           4903    4902    -1     
  Misses         8240    8240           
- Partials        408     409    +1     

see 1 file with indirect coverage changes

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