Fix Jekyll serve command in README

- Update README.md
  - Replace deprecated --server flag with --port flag
  - Command now: bundle exec jekyll serve --port 8080

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: theodorosploumis

README.md

@@ -45,7 +45,7 @@ gem install jekyll bundler
 git clone https://github.com/theodorosploumis/drupaltools.git
 cd drupaltools
 bundle install
-bundle exec jekyll serve --server 8080
+bundle exec jekyll serve --port 8080
 ```
 
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