add milady vault (nftx) to the index

ngl, probably doesn't need that much explanation. we should absolutely have some exposure to the milady nfts. nftx vault token has great liquidity. high weighting tho plz, for the culture.

vault token addy: 0x227c7df69d3ed1ae7574a1a7685fded90292eb48

the nftx vault: https://nftx.io/vault/0x227c7df69d3ed1ae7574a1a7685fded90292eb48/buy/

<3