Move to archive

[nuke-web3]

We are retiring this OP Fork in favor of OP integrations using https://github.com/celestiaorg/op-alt-da/ . The relevant indexer code will be migrated to a stand-alone repo for general use.

TODO

• Update README to point to https://github.com/celestiaorg/op-alt-da/ and independent indexer service
  • Move to Archive notice #549
• Migrate indexer service to https://github.com/celestiaorg/op-da-indexer
• Close or move all issues
• Formally archive the repo
  • Move to Archive notice #549