Fix GitHub Pages CI warning with GitHub Actions

- Add GitHub Actions workflow for Jekyll builds
- Update Gemfile with Jekyll 4.3.0 and required plugins
- Add jekyll-feed, jekyll-sitemap, and jekyll-seo-tag plugins
- Configure proper exclusions in _config.yml
- Remove dependency on deprecated github-pages gem

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: theodorosploumis

.github/workflows/jekyll.yml

@@ -0,0 +1,52 @@
+name: Build Jekyll Site
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  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
+
+      - name: Build with Jekyll
+        run: bundle exec jekyll build
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./_site
+
+  deploy:
+    if: github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master'
+    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

Gemfile

@@ -1,4 +1,23 @@
 source 'https://rubygems.org'
-gem 'jekyll'
+
+# Jekyll and GitHub Pages
+gem 'jekyll', '~> 4.3.0'
 gem 'liquid'
 gem "webrick", "~> 1.8"
+
+# GitHub Pages compatible plugins
+group :jekyll_plugins do
+  gem 'jekyll-feed'
+  gem 'jekyll-sitemap'
+  gem 'jekyll-seo-tag'
+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", "~> 0.1.1", :platforms => [:mingw, :x64_mingw, :mswin]

_config.yml

@@ -11,6 +11,23 @@ copyright: '<a href="https://www.drupal.org">Drupal</a> is a <a href="http://dru
 # Build settings
 markdown: kramdown
 
+# GitHub Pages compatible settings
+plugins:
+  - jekyll-feed
+  - jekyll-sitemap
+  - jekyll-seo-tag
+
+# Exclude from processing
+exclude:
+  - Gemfile
+  - Gemfile.lock
+  - node_modules
+  - vendor
+  - .git
+  - .github
+  - mcp-package
+  - api
+
 # yml_files = Dir.glob("_data/projects/*.yml")
 # puts "page_gen:"
 # yml_files.each do |file|