docs: add TweetClaw source packet recipe

[kriptoburak]

Summary

• Add a source-backed X / Twitter card recipe to the social share cards section.
• Point users to TweetClaw for collecting tweet text, author data, engagement counts, media URLs, and thread context before rendering with existing HTML Anything social-card skills.
• Keep HTML Anything responsible for visual rendering and export, while scraping, approval, and publishing stay outside this project.

Validation

• git diff --check
• pnpm install --frozen-lockfile
• pnpm exec tsx scripts/guard.ts
• curl -L https://github.com/Xquik-dev/tweetclaw -> 200
• curl -L https://www.npmjs.com/package/@xquik/tweetclaw -> 403, expected from npm web page in this environment
• npx --yes markdown-link-check README.md --quiet found one pre-existing target link failure: https://x.com/nexudotio returns 404. This PR does not add or modify that link.

[mrcfps]

@kriptoburak I reviewed the README addition for the TweetClaw-backed X / Twitter card flow, checked the linked skill paths under next/src/lib/templates/skills, and verified the changed diff is clean via git diff --check. This looks aligned with the existing social-card docs and I did not find any actionable issues. Thanks for tightening up the source-packet guidance 🙌

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