enable header demotion for ipynb
enable header demotion for ipynb

cc @michaelaye

Signed-off-by: Chris “Kwpolska” Warrick <de6f931166e131a07f31c96c765aee08f061d1a5@gmail.com>

okin/nikola,JohnTroony/nikola,xuhdev/nikola,getnikola/nikola,yamila-moreno/nikola,pluser/nikola,knowsuchagency/nikola,xuhdev/nikola,gwax/nikola,techdragon/nikola,pluser/nikola,atiro/nikola,masayuko/nikola,immanetize/nikola,berezovskyi/nikola,s2hc-johan/nikola,xuhdev/nikola,s2hc-johan/nikola,gwax/nikola,jjconti/nikola,techdragon/nikola,atiro/nikola,okin/nikola,schettino72/nikola,JohnTroony/nikola,jjconti/nikola,gwax/nikola,x1101/nikola,x1101/nikola,okin/nikola,lucacerone/nikola,jjconti/nikola,wcmckee/nikola,lucacerone/nikola,TyberiusPrime/nikola,andredias/nikola,schettino72/nikola,okin/nikola,andredias/nikola,xuhdev/nikola,TyberiusPrime/nikola,berezovskyi/nikola,getnikola/nikola,techdragon/nikola,masayuko/nikola,berezovskyi/nikola,yamila-moreno/nikola,getnikola/nikola,immanetize/nikola,wcmckee/nikola,JohnTroony/nikola,knowsuchagency/nikola,x1101/nikola,TyberiusPrime/nikola,knowsuchagency/nikola,andredias/nikola,wcmckee/nikola,s2hc-johan/nikola,yamila-moreno/nikola,immanetize/nikola,pluser/nikola,masayuko/nikola,atiro/nikola,getnikola/nikola,lucacerone/nikola,schettino72/nikola