docs: add GitHub Pages deployment via mdBook

Author: copyleftdev

.github/workflows/pages.yml

@@ -0,0 +1,55 @@
+name: Deploy Docs
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "docs/**"
+      - ".github/workflows/pages.yml"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install mdBook
+        env:
+          MDBOOK_VERSION: "0.4.40"
+        run: |
+          curl -sSL \
+            "https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz" \
+            | tar -xz --directory /usr/local/bin
+          mdbook --version
+
+      - name: Build docs
+        run: mdbook build docs/
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs/book
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

docs/book.toml

@@ -10,6 +10,9 @@ no-section-label = false
 fold.enable = true
 fold.level = 1
 additional-css = ["custom.css"]
+git-repository-url = "https://github.com/copyleftdev/parallax"
+git-repository-icon = "fa-github"
+site-url = "/parallax/"
 
 [output.html.playground]
 editable = true