Clean up this repo

[blairmunroakusa]

TODO:

• [x] update issues
• [x] regenerate ink docs
• [x] add README bit instructing bystanders to raise issue or discussion if they see something they disagree with
• [x] add README bit explaining multichain launch
• [x] fix all broken links
• [x] update all assets
• [ ] update all READMEs
• [x] lay out TGE issues into milestone
• [x] create ARB ILOCK contract readme w graphic