specs: initialize the specs folder and site

.github/workflows/specs-deploy.yml

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+name: Specs Deploy
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - specs/**
+  pull_request:
+    paths:
+      - specs/**
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup mdBook
+        uses: peaceiris/actions-mdbook@v1
+        with:
+          mdbook-version: "0.4.21"
+
+      - name: Build book
+        run: mdbook build specs
+
+      - name: Deploy main
+        if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./specs/book
+          # keep_files is to prevent PR preview files from being overwritten.
+          # If we need to overwrite such files, trigger this workflow manually.
+          keep_files: ${{ github.event_name != 'workflow_dispatch' }}
+
+      - name: Deploy PR preview
+        # Only run this job if the PR was created from a branch on
+        # rollkit/rollkit because this job will fail for branches from forks.
+        if: github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository
+        uses: rossjrw/pr-preview-action@v1
+        with:
+          source-dir: ./specs/book

specs/.gitignore

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+book

specs/README.md

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+# go-header Specifications
+
+## Building From Source
+
+Install [mdbook](https://rust-lang.github.io/mdBook/guide/installation.html) and [mdbook-toc](https://github.com/badboy/mdbook-toc):
+
+```sh
+cargo install mdbook
+cargo install mdbook-toc
+```
+
+To build book:
+
+```sh
+mdbook build
+```
+
+To serve locally:
+
+```sh
+mdbook serve
+```
+
+## Contributing
+
+Specifications are written and stored in the same directory with the implementation code. Since `mdbook` does not support referencing files outside of the book directory, we use a symlink to the `src/specs` directory. This allows us to reference the specifications from the `README.md` and `SUMMARY.md` files in the `src` directory.
+
+To create a symlink:
+
+```sh
+cd src/specs
+ln -s path/to/spec.md
+```
+
+Markdown files must conform to [GitHub Flavored Markdown](https://github.github.com/gfm/). Markdown must be formatted with:
+
+- [markdownlint](https://github.com/DavidAnson/markdownlint)
+- [Markdown Table Prettifier](https://github.com/darkriszty/MarkdownTablePrettify-VSCodeExt)

specs/book.toml

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+[book]
+authors = ["Celestia Labs"]
+language = "en"
+multilingual = false
+src = "src"
+title = "go-header Specifications"
+
+[output.html]
+git-repository-url = "https://github.com/celestiaorg/go-header"
+
+[rust]
+edition = "2021"
+
+[preprocessor.toc]
+command = "mdbook-toc"
+renderer = ["html"]

specs/src/README.md

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+# Welcome
+
+Welcome to the go-header Specifications.

specs/src/SUMMARY.md

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+# Summary
+
+[Introduction](README.md)
+
+- [Template](./specs/template.md)
+- [P2P](./specs/p2p.md)
+- [Store](./specs/store.md)
+- [Sync](./specs/sync.md)

specs/src/specs/p2p.md

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+../../../p2p/p2p.md

specs/src/specs/store.md

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+../../../store/store.md

specs/src/specs/sync.md

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+../../../sync/sync.md

specs/src/specs/template.md

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+../../template.md