update the config, and use bundler

.bundle/config

@@ -0,0 +1,2 @@
+---
+BUNDLE_PATH: "vendor/bundle"

.gitignore

@@ -11,3 +11,4 @@ Thumbs.db
 *~
 .jekyll-cache
 /node_modules
+/vendor/bundle/

Gemfile

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+# gem "rails"
+
+gem "jekyll", "~> 4.3"
+
+gem "logger", "~> 1.6"
+
+gem "csv", "~> 3.3"
+
+gem "base64", "~> 0.2.0"

Gemfile.lock

@@ -0,0 +1,88 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.8.7)
+      public_suffix (>= 2.0.2, < 7.0)
+    base64 (0.2.0)
+    bigdecimal (3.1.8)
+    colorator (1.1.0)
+    concurrent-ruby (1.3.4)
+    csv (3.3.0)
+    em-websocket (0.5.3)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0)
+    eventmachine (1.2.7)
+    ffi (1.17.0)
+    ffi (1.17.0-x86_64-linux-gnu)
+    forwardable-extended (2.6.0)
+    google-protobuf (4.28.2)
+      bigdecimal
+      rake (>= 13)
+    google-protobuf (4.28.2-x86_64-linux)
+      bigdecimal
+      rake (>= 13)
+    http_parser.rb (0.8.0)
+    i18n (1.14.6)
+      concurrent-ruby (~> 1.0)
+    jekyll (4.3.4)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      em-websocket (~> 0.5)
+      i18n (~> 1.0)
+      jekyll-sass-converter (>= 2.0, < 4.0)
+      jekyll-watch (~> 2.0)
+      kramdown (~> 2.3, >= 2.3.1)
+      kramdown-parser-gfm (~> 1.0)
+      liquid (~> 4.0)
+      mercenary (>= 0.3.6, < 0.5)
+      pathutil (~> 0.9)
+      rouge (>= 3.0, < 5.0)
+      safe_yaml (~> 1.0)
+      terminal-table (>= 1.8, < 4.0)
+      webrick (~> 1.7)
+    jekyll-sass-converter (3.0.0)
+      sass-embedded (~> 1.54)
+    jekyll-watch (2.2.1)
+      listen (~> 3.0)
+    kramdown (2.4.0)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
+    liquid (4.0.4)
+    listen (3.9.0)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
+    logger (1.6.1)
+    mercenary (0.4.0)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    public_suffix (6.0.1)
+    rake (13.2.1)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.11.1)
+      ffi (~> 1.0)
+    rexml (3.3.8)
+    rouge (4.4.0)
+    safe_yaml (1.0.5)
+    sass-embedded (1.80.3)
+      google-protobuf (~> 4.28)
+      rake (>= 13)
+    sass-embedded (1.80.3-x86_64-linux-gnu)
+      google-protobuf (~> 4.28)
+    terminal-table (3.0.2)
+      unicode-display_width (>= 1.1.1, < 3)
+    unicode-display_width (2.6.0)
+    webrick (1.8.2)
+
+PLATFORMS
+  ruby
+  x86_64-linux
+
+DEPENDENCIES
+  base64 (~> 0.2.0)
+  csv (~> 3.3)
+  jekyll (~> 4.3)
+  logger (~> 1.6)
+
+BUNDLED WITH
+   2.5.16

README.md

@@ -5,3 +5,13 @@ This repository contains the official www.cgal.org website and documentation for
 ## Issues ##
 
 Issues should be opened on the [CGAL/cgal](https://github.com/CGAL/cgal/issues) repository.
+
+## Contributing ##
+
+Install Bundler: https://jekyllrb.com/tutorials/using-jekyll-with-bundler/
+
+Then:
+
+```shell
+    bundle exec jekyll serve
+```

_config.yml

@@ -4,7 +4,16 @@ permalink: /:categories/:year/:month/:day/:title/
 include:
   - .htaccess
   - node_modules
-exclude: [".rvmrc", ".rbenv-version", "README.md", "Rakefile", "changelog.md", "web_old"]
+exclude:
+  - ".rvmrc"
+  - ".rbenv-version"
+  - "README.md"
+  - "Rakefile"
+  - "changelog.md"
+  - "web_old"
+  - node_modules/*/docs_src
+  - node_modules/*/src
+  - node_modules/bootstrap/js
 # Themes are encouraged to use these universal variables
 # so be sure to set them if your theme uses them.
 #