Finished module "Substrate Kitties (>7.0.0): Updated version"

[chungquantin]

ISSUES

I walked through the original Substrate Kitties workshop materials and seems like it is so deprecated. Hence, I rebuilt the tutorial and will expand it a bit more as I found this is an exciting thing to work on and deliver.

Link to the repository: https://github.com/lowlevelers/substrate-kitties

What I will add next?

• migrate to pallet-nft to deliver production-ready code
• migrate insecure on-chain randomness to BABE pallet randomness
• build NFT auction functionalities
• let's bring all these to an online rust book with mdbook