docs: Build with mdBook

Signed-off-by: Tim Crawford <tcrawford@system76.com>

docs/README.md

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-# System76 Open Firmware Documentation

docs/SUMMARY.md

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+# Summary
+
+- [Index](./index.md)
+- [Firmware features](./features.md)
+- [Flashing firmware](./flashing.md)
+- [Debugging](./debugging.md)
+- [Adding a new board](./adding-a-new-board.md)
+- [Intel CSME](./intel-me.md)
+- [UEFI](./uefi.md)

docs/book.toml

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+[book]
+title = "System76 Open Firmware"
+description = "System76 Open Firmware documentation"
+language = "en"
+src = "."
+
+[build]
+build-dir = "../build/docs"
+create-missing = false
+
+[output.html]
+default-theme = "rust"
+preferred-dark-theme = "coal"
+no-section-label = true
+git-repository-url = "https://github.com/system76/firmware-open"
+
+[output.html.print]
+enable = false

docs/index.md

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+# Documentation
+
+This is the documentation for System76 Open Firmware. It is set up to be used
+with [mdBook], which can generate HTML output for easy navigation.
+
+
+[mdBook]: https://github.com/rust-lang/mdBook