add mdbook

diff --git a/mdbook/README.md b/mdbook/README.md
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+# mdBook
+
+WARNING: This is probably not the most recent version of mdBook, as I do not maintain this image very actively.
+
+Runs [mdBook](github.com/rust-lang/mdBook/) in a docker container. To use, you need to mount an initialized book to `/book` in the docker container. You can initialize a book using `docker run -v PATH/TO/BOOK:/book armaanb/mdbook mdbook init`. Then serve it using `docker run -v PATH/TO/BOOK:/book -p 3000:3000 armaanb/mdbook`

diff --git a/mdbook/latest/Dockerfile b/mdbook/latest/Dockerfile
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+FROM rust as builder
+RUN cargo install mdbook
+
+FROM debian:buster-slim
+COPY --from=builder /usr/local/cargo/bin/mdbook /bin/mdbook
+WORKDIR /book
+CMD mdbook serve -n 0.0.0.0