docs(l1,l2): add recommended lectures

[lferrigno]

Adds a new “Recommended Lectures” section to the documentation.

A disclaimer was also added to note that the section is still under development.

[Copilot]

Pull Request Overview

This PR adds a new "Recommended Lectures" section to the documentation with initial content focusing on Ethereum internals and zero-knowledge systems. The section includes a disclaimer noting it's under development.

• Added a new lectures.md file with recommended learning materials
• Integrated the new section into the documentation navigation structure

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
docs/lectures.md	New file containing recommended lectures with development disclaimer
docs/SUMMARY.md	Added navigation link to the new lectures section

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[Copilot]

The recommended materials are social media posts rather than formal lectures or educational content. Consider including actual lecture videos, academic papers, or structured educational resources that align with the section title 'Recommended lectures'.

Suggested change

	- [ENDGAME: How MegaETH bridges throughput and decentralization](https://x.com/megaeth_labs/status/1978854478943256986?s=12)
	- [ENDGAME: How SALT breaks the bottleneck that's been strangling blockchains](https://x.com/megaeth_labs/status/1962902246573879530?s=12)
	- [Ethereum: The World Computer](https://www.youtube.com/watch?v=AfmGk2n5Tj0) — Lecture by Vitalik Buterin at MIT, covering Ethereum internals and design.
	- [Zero Knowledge Proofs: An Introduction](https://www.youtube.com/watch?v=GJ4Qp2xeRds) — Stanford CS251 lecture by Dan Boneh, explaining ZKPs and their applications.
	- [Distributed Systems: Concepts and Design](https://www.coursera.org/learn/cloud-computing) — Coursera course by University of Illinois, covering distributed systems fundamentals.
	- [A Next-Generation Smart Contract and Decentralized Application Platform](https://ethereum.org/en/whitepaper/) — Ethereum Whitepaper by Vitalik Buterin.