Update and Improve Use section

[Juminstock]

Changelog:

• Replaced UCG program page with ACC Strategic Staking Program (SSP): Lane A/B mechanics, eligibility criteria, first operation (April 2026, 122M ASTR across 5 projects)
• Removed MetaMask Snap page and all references (deprecated feature)
• Fixed 15+ prose em-dashes → commas across FAQs, staking guides, governance, and portal docs
• Removed banned words: seamless, empower, novel approach, innovative, robust across 10+ files
• Fixed spelling: on-chain→onchain, Web3→web3, and 8 typos (funtions, reponse, Cheching, comnmunity, priveledge, lost→loss, These is→This is)
• Removed first-person voice: "our most recommended" → "the recommended"
• Replaced marketing blockquote in Soneium transfer index with factual description
• Fixed dApp Staking index and staker/dev overview: removed "novel approach" and "unique mechanism"

[github-actions]

Visit the preview URL for this PR (updated for commit cdd8c5b):

https://astar-docs--pr789-updates-improve-use-0klhgtzw.web.app

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