feat: add OG image for social sharing

[ajianaz]

Summary

• Add 1200×630 OG image (website/static/og.png) with dark theme matching cora-cli branding
• Terminal decoration showing cora review output
• Purple brand colors, Inter font, version badge

Context

PR #55 fixed OG tags domain to cora.ajianaz.dev but the actual og.png file was missing (404). This adds the image.

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (1)

• website/static/og.png is excluded by !**/*.png

CodeRabbit blocks several paths by default. You can override this behavior by explicitly including those paths in the path filters. For example, including **/dist/** will override the default block on the dist directory, by removing the pattern from both the lists.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f5891622-7e41-4937-96f3-d6f94c144b41

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/og-image

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[github-actions]

🔍 Cora AI Code Review

✅ No issues found. Code looks good!