Added new Repos to Arbitrum ecosystem

[realjockel]

This PR adds new Arbitrum ecosystem projects created during a mini hackathon.

[yizhao-ec]

Thanks for the submission!

Changes Required

1. Wrong Ecosystem

These repos are built for other blockchains, not Arbitrum. Please remove them:

• Line 2: zvy22606/pencil-finance-contract → built for UniUltra (u2uTestnet)
• Line 30: YuzeHao2023/tetris.rs → pure Rust Tetris game, no blockchain integration
• Line 31: dvlan26/Crowdfunding-dApp-Demo → built for Stellar (Soroban)
• Line 35: Arijit166/Nexus → built on Flow EVM Testnet
• Line 38: iamomm-hack/ChatMint-AI → built on Story Protocol
• Line 41: louissarvin/fndr → built for Mantle Network
• Line 48: YashDave11/Chain-Agent → built on Ethereum Sepolia

2. Inaccessible Repository

• Line 37: mememan-anon/celar → returns 404 (private, deleted, or doesn't exist)

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Next Steps

Please remove the 8 repos listed above and push an updated commit.

[realjockel]

Perfect! Really appreciate the response and review. I've removed those repositories.