Add Celestia attribution

In an earlier version, we rebased their commits for the sake of a clean diff.
In this version, we have instead chosen to work off their commit for clarity of
attribution.  You can find their changes to OP Stack here: <celestiaorg/optimism@d83d851...celestia-develop>

README.md

@@ -153,3 +153,10 @@ It's strongly recommended to avoid merging PRs into develop during an active rel
 ## License
 
 All other files within this repository are licensed under the [MIT License](https://github.com/ethereum-optimism/optimism/blob/master/LICENSE) unless stated otherwise.
+
+## Attributions
+
+We based this code off of the [Celestia integration](https://github.com/celestiaorg/optimism) of the same nature, and
+in an earlier version, we rebased their commits for the sake of a clean diff. In this version, we have instead chosen to work off their commit for clarity of attribution.
+
+You can find their changes to OP Stack here: <https://github.com/celestiaorg/optimism/compare/d83d85157951d2a424bbd99246ecd13ecbf7ee69...celestia-develop>

op-service/txmgr/txmgr.go

@@ -189,10 +189,10 @@ func (m *SimpleTxManager) send(ctx context.Context, candidate TxCandidate) (*typ
 		defer cancel()
 	}
 
-	// TODO: this is a hack to route only batcher transactions through celestia
+	// TODO: this is a hack to route only batcher transactions through ~~celestia~~ EigenDA
 	// SimpleTxManager is used by both batcher and proposer but since proposer
 	// writes to a smart contract, we overwrite _only_ batcher candidate as the
-	// frame pointer to celestia, while retaining the proposer pathway that
+	// frame pointer to ~~celestia~~ EigenDA, while retaining the proposer pathway that
 	// writes the state commitment data to ethereum.
 	// if candidate.To.Hex() == "0xfF00000000000000000000000000000000000000" {
 	if candidate.To.Hex() == "0xFf00000000000000000000000000000000000901" {