docs: convert core and prover docs to mdbook project and add CI

.github/workflows/deploy-core-docs.yml

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+name: Deploy core docs
+
+on:
+  push:
+    branches:
+      - "main"
+    tags:
+      - "core-v*.*.*"
+    paths:
+      - 'docs/**'
+      - '.github/workflows/deploy-core-docs.yml'
+  pull_request:
+    paths:
+      - 'docs/**'
+      - '.github/workflows/deploy-core-docs.yml'
+  workflow_dispatch:
+    inputs:
+      ref:
+        description: "Branch, tag or commit to deploy the core docs. If empty, use the ref that triggered the workflow."
+        required: false
+        default: ""
+      version:
+        type: string
+        description: "Version of the documentation to deploy"
+        required: false
+        default: "latest"
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+
+  deploy-core-docs:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    env:
+      DOCS_DIR: 'docs'
+      PROJECT: 'core'
+      ENABLE_TESTS: false
+    steps:
+      - name: Checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        with:
+          ref: ${{ inputs.ref || '' }}
+
+      - name: Extract version from tag
+        if: startsWith(github.ref, 'refs/tags/')
+        id: extract-version
+        shell: 'bash -ex {0}'
+        run: |
+          TAG="${{ github.ref_name }}"
+          VERSION="${TAG#*-}"
+          echo "version=${VERSION}" >> "${GITHUB_OUTPUT}"
+
+      - name: Deploy core docs
+        uses: matter-labs/deploy-mdbooks@77856145362bf23834f2e54a44a928790c4bee7c # v1
+        with:
+          version: ${{ inputs.version || steps.extract-version.outputs.version || github.ref_name }}
+          docs-dir: ${{ env.DOCS_DIR }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          enable-tests: ${{ env.ENABLE_TESTS }}
+          project: ${{ env.PROJECT }}
+          deploy: ${{ github.event_name != 'pull_request' }}

.github/workflows/deploy-prover-docs.yml

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+name: Deploy prover docs
+
+on:
+  push:
+    branches:
+      - "main"
+    tags:
+      - "prover-v*.*.*"
+    paths:
+      - 'prover/docs/**'
+      - '.github/workflows/deploy-prover-docs.yml'
+  pull_request:
+    paths:
+      - 'prover/docs/**'
+      - '.github/workflows/deploy-prover-docs.yml'
+  workflow_dispatch:
+    inputs:
+      ref:
+        description: "Branch, tag or commit to deploy the prover docs. If empty, use the ref that triggered the workflow."
+        required: false
+        default: ""
+      version:
+        type: string
+        description: "Version of the documentation to deploy"
+        required: false
+        default: "latest"
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+
+  deploy-prover-docs:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    env:
+      DOCS_DIR: 'prover/docs'
+      PROJECT: 'prover'
+      ENABLE_TESTS: false
+    steps:
+      - name: Checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        with:
+          ref: ${{ inputs.ref || '' }}
+
+      - name: Extract version from tag
+        if: startsWith(github.ref, 'refs/tags/')
+        id: extract-version
+        shell: 'bash -ex {0}'
+        run: |
+          TAG="${{ github.ref_name }}"
+          VERSION="${TAG#*-}"
+          echo "version=${VERSION}" >> "${GITHUB_OUTPUT}"
+
+      - name: Deploy prover docs
+        uses: matter-labs/deploy-mdbooks@77856145362bf23834f2e54a44a928790c4bee7c # v1
+        with:
+          version: ${{ inputs.version || steps.extract-version.outputs.version || github.ref_name }}
+          docs-dir: ${{ env.DOCS_DIR }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          enable-tests: ${{ env.ENABLE_TESTS }}
+          project: ${{ env.PROJECT }}
+          deploy: ${{ github.event_name != 'pull_request' }}

docs/.gitignore

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+book

docs/book.toml

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+[book]
+authors = ["ZKsync team"]
+language = "en"
+multilingual = false
+src = "src"
+title = "ZKsync Era Documentation"
+
+[output.html]
+smart-punctuation = true
+mathjax-support = true
+git-repository-url = "https://github.com/matter-labs/zksync-era/tree/main/docs"
+edit-url-template = "https://github.com/matter-labs/zksync-era/tree/main/docs/{path}"
+additional-js = ["js/version-box.js", "js/mermaid.min.js", "js/mermaid-init.js"]
+additional-css = ["css/version-box.css"]
+
+[output.html.playground]
+editable = true
+line-numbers = true
+
+[output.html.search]
+limit-results = 20
+use-boolean-and = true
+boost-title = 2
+boost-hierarchy = 2
+boost-paragraph = 1
+expand = true
+heading-split-level = 2
+
+[preprocessor]
+
+[preprocessor.mermaid]
+command = "mdbook-mermaid"

docs/css/version-box.css

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+#version-box {
+    display: flex;
+    align-items: center;
+    margin-right: 15px; /* Space from the right side */
+    background-color: transparent; /* Make the box background transparent */
+}
+
+/* Base styles for the version selector */
+#version-selector {
+    background-color: transparent; /* Remove background color */
+    border: 1px solid #4a5568;     /* Subtle border */
+    border-radius: 4px;            /* Rounded edges */
+    padding: 5px 10px;             /* Padding inside dropdown */
+    font-size: 0.9em;
+    font-weight: normal;
+    outline: none;                 /* Removes default focus outline */
+    cursor: pointer;
+}
+
+/* Text color for dark themes */
+.theme-navy #version-selector,
+.theme-coal #version-selector {
+    color: #f7fafc; /* Light text color for dark backgrounds */
+}
+
+/* Text color for light theme */
+.theme-light #version-selector {
+    color: #333333; /* Dark text color for light background */
+}
+
+/* Hover effect for better user feedback */
+#version-selector:hover {
+    background-color: rgba(255, 255, 255, 0.1); /* Light hover effect */
+}
+
+/* Optional: Style for when the selector is focused */
+#version-selector:focus {
+    border-color: #63b3ed; /* Accent color for focused state */
+}
+
+.right-buttons {
+    display: flex;
+    flex-direction: row;     /* Aligns items in a row, left to right */
+    align-items: center;     /* Centers items vertically */
+    gap: 10px;               /* Adds space between items */
+}