Update further reading section on optimistic rollups page

- Added a comprehensive article analyzing the different types of rollups (including newer designs like sovereign rollups)
- Added a research report on fraud proof systems used by Ethereum L2s

Author: emmanuel-awosika

public/content/developers/docs/scaling/optimistic-rollups/index.md

@@ -264,6 +264,8 @@ Multiple implementations of Optimistic rollups exist that you can integrate into
 - [How do optimistic rollups work (The Complete guide)](https://www.alchemy.com/overviews/optimistic-rollups)
 - [What is a Blockchain Rollup? A Technical Introduction](https://www.ethereum-ecosystem.com/blog/what-is-a-blockchain-rollup-a-technical-introduction)
 - [The Essential Guide to Arbitrum](https://newsletter.banklesshq.com/p/the-essential-guide-to-arbitrum)
+- [The Practical Guide To Ethereum Rollups](https://research.2077.xyz/the-practical-guide-to-ethereum-rollups)
+- [The State Of Fraud Proofs In Ethereum L2s](https://research.2077.xyz/the-state-of-fraud-proofs-in-ethereum-l2s)
 - [How does Optimism's Rollup really work?](https://www.paradigm.xyz/2021/01/how-does-optimisms-rollup-really-work)
 - [OVM Deep Dive](https://medium.com/ethereum-optimism/ovm-deep-dive-a300d1085f52)
 - [What is the Optimistic Virtual Machine?](https://www.alchemy.com/overviews/optimistic-virtual-machine)