Add security reports for Nitro(03/22), USDC Custom Gateway, & Upgrade Actions 2.1

[leeederek]

This pull requests adds 3 audit reports from Trail of Bits:

• Nitro from march 2022
• USDC custom gateway + a small arbos upgrade timestamp action contract
• Orbit and Governance action contracts v2.1

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Name	Status	Preview	Updated (UTC)
arbitrum-docs	✅ Ready (Inspect)	Visit Preview	Aug 30, 2024 11:58am