Add new color for spoilers links

[reda777]

Spoilers links will have a dashed pink underline. The issue suggested orange, but I think it will be hard to differentiate from red and yellow. Closes #471

[ILiedAboutCake]

I might actually be colorblind because I cannot tell the difference here, we probably want to use something with a drastic different shade

[reda777]

Pink looks fine to me:

• nsfw:
  
• nsfl:
  
• this pull request's pink:
  
• darker pink:
  
• If you want to give up pink, green could work
  

[ILiedAboutCake]

@reda777 Thanks for the contribution, Drop your DGG username or DM me on DGG and I'll throw a subscription your way for your efforts : D