Add initial 11ty website structure

website/ARCHITECTURE.md

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+# KST4Contest Website Architecture
+
+## Goals
+
+KST4Contest uses GitHub as the central source for code, documentation and releases.
+
+The website is generated statically with Eleventy (11ty) and deployed to:
+
+https://kst4contest.hamradioonline.de
+
+## Documentation Source
+
+The existing `github_docs/` directory remains the single source of truth for the manual.
+
+It is used for:
+
+- GitHub Wiki
+- PDF manual generation
+- Website manual pages
+
+## Website Source
+
+The `website/` directory contains the Eleventy project.
+
+Manual content must not be duplicated inside `website/`.
+
+Marketing, SEO, news, screenshots and download pages belong into `website/src/`.
+
+## URL Structure
+
+- `/`
+- `/features/`
+- `/download/`
+- `/screenshots/`
+- `/news/`
+- `/manual/`
+- `/manual/en/`
+- `/manual/de/`
+- `/faq/`
+
+## Deployment
+
+The generated static output is deployed to:
+
+`/srv/www/kst4contest/current`
+
+Nginx serves this directory.
+
+## Build Strategy
+
+GitHub Actions will later build the 11ty website and deploy the generated output to the server.