Rewamp docs content

[Siegrift]

Closes #292
Closes #295

Summary

Adds a new Curation section to the docs, covering Api3's role as a curator of USDC vaults on Morpho and cleans up the OEV docs given there is no OEV Network.

I think the current docs structure is decent and the addition of the "Curation" tab works well. I do not consider the curation content to be perfect nor complete, but it's a decent start. It's also going to change soon, because Morpho wants the V2 vaults to stop using v1 vaults as intermediaries, which affects our operations.

What's new

• Top nav — New "Curation" entry alongside dApps and OEV Searchers.
• Overview (/curation/) — Intro to Api3 x Morpho, the skin-in-the-game thesis, yield source, the OEV competitive advantage, vault summary (Api3 Core, Kabu, Api3 dCOMP), and fee structure.
• Roles and operations (/curation/roles-and-operations) — Role table, two-layer V2→V1 vault architecture, allocation/rebalancing, monitoring stack, and liquidation handling.
• Risk management (/curation/risk-management) — Market selection criteria anchored to Api3's data feed listing policy, supply-cap methodology, and treasury-backed risk alignment.
• Disclosure (/curation/disclosure) — Scope of curation, no-advice clause, risk factors, restricted jurisdictions, and limitation of liability. Links to the Api3 terms and conditions. Pending review from Erich.

[github-actions]

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