YIP 33: Add LINK to yVaults

@ChainlinkBull @Anon216 please refrain from price discussion: discord or telegram are much better place.

@ChainlinkBull as to YIP-17 removal, current process is not smooth but there is somewhat guideline how to make it work for everyone: Proposal How-To

Specifically:

  1. Don’t rush with putting a proposal on chain, keep discussion going for at least 3 days.

*We both know that link will win anyway once new poll is opened :speak_no_evil: