Drop MassMint v2

[yangwao]

random order

• [ ] https://github.com/kodadot/nft-gallery/issues/9718
• [x] https://github.com/kodadot/nft-gallery/issues/9756
• [x] https://github.com/kodadot/nft-gallery/issues/9750
• [ ] https://github.com/kodadot/nft-gallery/issues/9719
• [x] https://github.com/kodadot/nft-gallery/issues/9720
• [x] https://github.com/kodadot/nft-gallery/issues/9723
• [x] https://github.com/kodadot/nft-gallery/issues/9761
• [x] https://github.com/kodadot/nft-gallery/issues/9712
• [x] https://github.com/kodadot/nft-gallery/issues/9774
• [x] https://github.com/kodadot/nft-gallery/issues/9779

[yangwao]

Three to go, if anyone take on this

[exezbcz]

most of the things solved with random mint or?