Add OpenZeppelin Tools References

[stevedylandev]

Hey there!

I'm with OpenZeppelin and we were curious if Startknet would be open to some additions to the docs that could benefit users. Here's a short list of things we think might be helpful from OpenZeppelin's offering:

• Add header OpenZeppelin Contracts and Tools to Next Steps page and include links to:
  • Contracts for Cairo
  • Contracts Wizard for Cairo
  • Cairo Contracts MCP
• Add MCP to Ecosystem Tools page
• Add Audited Examples - Applications
  • ERC1155
  • Governance Modules
  • Role Based Access Controls

Let us know if any or all of these sounds interesting and I can start a pull request!