Update compressed nfts

[adpthegreat]

• Followed guidelines in contributing.md
• Refactored it to use newest dependencies
• Replaced @metaplex- foundation/js with @metaplex-foundation-umi
• Replaced old methods with their corresponding umi methods
• Replaced all old code snippets
• Gave clearer variable names
• Removed redundant code
• Ran prettier

updated lesson code and created Unboxed PRs

solution code starter code