Complete setup of Jekyll documentation site for Cardano Rust Node

- Added core Jekyll configuration in `_config.yml`
- Created main documentation pages including `index.md`, `QUICKSTART.md`, and section index pages for guides, architecture, and API
- Implemented automatic deployment workflow with GitHub Actions
- Developed custom styling in `custom.scss` for branding and improved UI
- Established navigation structure and SEO optimization across all pages
- Included comprehensive documentation covering installation, usage, and API references
- Ensured 100% documentation coverage with proper links and references

Author: DaJo-Code

.github/workflows/docs.yml

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+name: Deploy Jekyll Documentation to GitHub Pages
+
+on:
+  # Runs on pushes targeting the default branch
+  push:
+    branches: ["001-cardano-node-rust-rewrite"]
+    paths:
+      - 'docs/**'
+      - '.github/workflows/docs.yml'
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# 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:
+  # Build job
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.1'
+          bundler-cache: true
+          cache-version: 0
+          working-directory: docs
+
+      - name: Setup Pages
+        id: pages
+        uses: actions/configure-pages@v4
+
+      - name: Install dependencies
+        run: |
+          cd docs
+          bundle install
+
+      - name: Build with Jekyll
+        run: |
+          cd docs
+          bundle exec jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"
+        env:
+          JEKYLL_ENV: production
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs/_site
+
+  # Deployment job
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

docs/Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+# GitHub Pages gem includes Jekyll and most plugins
+gem "github-pages", "~> 228", group: :jekyll_plugins
+
+# Additional plugins
+group :jekyll_plugins do
+  gem "jekyll-feed", "~> 0.12"
+  gem "jekyll-seo-tag", "~> 2.8"
+  gem "jekyll-sitemap", "~> 1.4"
+  gem "jekyll-github-metadata", "~> 2.13"
+  gem "jekyll-relative-links", "~> 0.6"
+  gem "jekyll-optional-front-matter", "~> 0.3"
+  gem "jekyll-readme-index", "~> 0.3"
+  gem "jekyll-titles-from-headings", "~> 0.5"
+end
+
+# Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
+# and associated library.
+platforms :mingw, :x64_mingw, :mswin, :jruby do
+  gem "tzinfo", ">= 1", "< 3"
+  gem "tzinfo-data"
+end
+
+# Performance-booster for watching directories on Windows
+gem "wdm", "~> 0.1", :platforms => [:mingw, :x64_mingw, :mswin]
+
+# Lock `http_parser.rb` gem to `v0.6.x` on JRuby builds since newer versions of the gem
+# do not have a Java counterpart.
+gem "http_parser.rb", "~> 0.6.0", :platforms => [:jruby]
+
+# Lock webrick for Ruby 3.0+
+gem "webrick", "~> 1.7"