chore(docs): Update readme (#392)

Closes #391

Updates readme to reflect migration OP-unique primitives to `maili`

README.md

@@ -5,7 +5,8 @@
 <a href="https://github.com/alloy-rs/op-alloy/blob/main/LICENSE-MIT"><img src="https://img.shields.io/badge/License-MIT-d1d1f6.svg?label=license&labelColor=2a2f35" alt="License"></a>
 <a href="https://alloy-rs.github.io/op-alloy"><img src="https://img.shields.io/badge/Book-854a15?logo=mdBook&labelColor=2a2f35" alt="Book"></a>
 
-Built on [Alloy][alloy], op-alloy connects applications to the OP Stack.
+Built on [Alloy][alloy], op-alloy aggregates the OP stack's unique primitives from [Maili][maili], 
+to the subset of L1 types used by Optimistic rollups.
 
 
 ## Usage
@@ -80,6 +81,7 @@ shall be dual licensed as above, without any additional terms or conditions.
 
 [check-no-std]: ./scripts/check_no_std.sh
 
+[maili]: https://github.com/op-rs/maili
 [kona]: https://github.com/op-rs/kona
 [alloy]: https://github.com/alloy-rs/alloy
 [contributing]: https://alloy-rs.github.io/op-alloy