docs(readme): restore the title heading and drop the duplicate intro

[andybons]

The README leads with an ANSI wordmark block and no H1, so screen readers and outline navigation get no document title.

This adds # Keep above the wordmark block, matching the Charm convention of title then logo.

It also drops the old intro paragraph at line 19, which restated the header tagline almost word for word; the tagline stays as the single source of that sentence.

Same fix as majorcontext/moat#471, majorcontext/gatekeeper#74, and majorcontext/harness#350.

[claude]

Claude finished @andybons's task in 8s —— View job

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Review

This looks good. I found no issues.

• # Keep is now the only H1, and the rest of the README uses ## and below, so the heading hierarchy is fine.
• The removed intro paragraph was a near-duplicate of the tagline at line 15. The tagline still covers the same points (deny, redact, log, before reaching upstream). The next paragraph still explains the library, gateway and relay modes, so the flow reads correctly.
• I checked the rest of the README for links or anchors that pointed at the removed paragraph and found none.

This is a docs-only change, so I didn't run any tests.

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused documentation changes correctly improve accessibility and clarity.

Review effort: Balanced
Findings: None

What changed in this PR

Adds an accessible document title and removes redundant introductory text.

Changes:

• Adds # Keep before the ANSI wordmark.
• Removes the paragraph duplicating the tagline.

File	Description
README.md	Improves heading navigation and eliminates duplicated copy.

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