refactor: extract wiki to source files, use deploy-pages action

wiki/index.md

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+# Wiki - RetroBIOS
+
+Technical documentation for the RetroBIOS toolchain.
+
+## Pages
+
+- **[Architecture](architecture.md)** - directory structure, data flow, platform inheritance, pack grouping, security, edge cases, CI workflows
+- **[Tools](tools.md)** - CLI reference for every script, pipeline usage, scrapers
+- **[Profiling guide](profiling.md)** - how to create an emulator profile from source code, step by step, with YAML field reference
+- **[Data model](data-model.md)** - database.json structure, indexes, file resolution order, YAML formats
+
+## For users
+
+If you just want to download BIOS packs, see the [home page](../index.md).
+
+## For contributors
+
+Start with the [profiling guide](profiling.md) to understand how emulator profiles are built,
+then see [contributing](../contributing.md) for submission guidelines.