feat: add AgentSkill documentation page (#162)

[raifdmueller]

Summary

• New dedicated page explaining the semantic-anchor-translator AgentSkill
• Installation instructions for Claude Code, GitHub Copilot, Cursor, and generic AI tools
• Bilingual (EN + DE)
• Nav link added (desktop + mobile)
• Pre-rendered via render-docs.js

Closes #162

Test plan

• npm test — 87 tests passing
• render-docs.js generates agentskill.html and agentskill.de.html
• Nav link appears in desktop and mobile menu
• Language switch reloads correct translation

🤖 Generated with Claude Code

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Review profile: CHILL

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Run ID: 4fa1debe-acfc-413b-9061-bd536300516b

📥 Commits

Reviewing files that changed from the base of the PR and between 04aee25 and 832922e.

📒 Files selected for processing (7)

• docs/agentskill.adoc
• docs/agentskill.de.adoc
• scripts/render-docs.js
• website/src/components/header.js
• website/src/main.js
• website/src/translations/de.json
• website/src/translations/en.json

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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