Init MDBook and Nix

Signed-off-by: Egor Savkin <es@m-labs.hk>

.gitignore

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+book

README.md

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 # sinara-assembly
 
 Repository with instructions and remarks on assembling and testing Sinara hardware
+
+# Build docs
+
+```shell
+nix build
+```
+
+The output files are in `result/book` directory.
+
+# Development shell
+
+```shell
+nix develop
+mdbook build
+```
+
+The output files are in `book` directory

book.toml

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+[book]
+authors = ["M-Labs Limited"]
+language = "en"
+multilingual = false
+src = "src"
+title = "Sinara Assembly"

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1675237434,
+        "narHash": "sha256-YoFR0vyEa1HXufLNIFgOGhIFMRnY6aZ0IepZF5cYemo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "285b3ff0660640575186a4086e1f8dc0df2874b5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-22.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+    description = "Sinara assembly and test instructions";
+
+    inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-22.11;
+
+    outputs = { self, nixpkgs }:
+
+    let pkgs = import nixpkgs { system = "x86_64-linux"; };
+
+    in {
+    packages.x86_64-linux.default =
+        # Notice the reference to nixpkgs here.
+        with import nixpkgs { system = "x86_64-linux"; };
+        stdenv.mkDerivation {
+          name = "book";
+          src = self;
+          buildInputs = with pkgs; [ pkgs.mdbook ];
+          buildPhase = "mdbook build";
+          installPhase = "mkdir -p $out/book; cp -R book $out/";
+        };
+    devShell.x86_64-linux = pkgs.mkShell {
+            name = "sinara-assembly-dev-shell";
+            buildInputs = with pkgs; [pkgs.mdbook];
+        };
+
+    };
+}

src/SUMMARY.md

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+# Summary
+
+- [Chapter 1](./chapter_1.md)

src/chapter_1.md

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+# Chapter 1