docs: rewrite the Manifest order book page around the USDT/USDC market

[buddies2705]

Rewrites the Manifest page around the fills the cubes record: the USDT/USDC market as the worked example, live fills and price feed, one-minute candles, buy and sell volume, top traders and the busiest markets.

What changed

• Worked market 8sjV1AqBFvFuADBCQHhotaRq5DFFYSjjg1jMyVWMqXvZ (USDT/USDC) replaces a stale example
• Price, price feed, 1-minute OHLC, volume by side and top traders by signer
• Busiest markets query; FAQ states that the cubes hold fills, not resting orders
• sidebar_label, FAQ, related links; title under 80 characters

Verification

• Every query and subscription on the page was executed with a live token: 5/5 queries returned rows; 2/2 subscriptions delivered messages within the timeout.

Fact checklist

• Manifest program MNFSTqtC93rEfYHB6hF82sKdZpUDFWkViLByLd1k1Ms; ProtocolFamily Manifest, ProtocolName manifest
• USDT/USDC is the busiest Manifest market at the time of writing
• Interval aggregates run as queries only

IDE saved queries linked from this page are updated by IDE_QUERY_UPDATES_2026-09-venue.sql (repo root, git-excluded), to be run on the primary database.

Part of the crawled-not-indexed cleanup (P2 block): venue pages are rewritten around live examples so every query and stream on them returns data, and the three EVM screener pages are split so they stop being treated as copies of one another.

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