Simplify Jekyll serve command in README

- Update README.md
  - Remove --port flag (uses default port 4000)
  - Command now: bundle exec jekyll serve
  - Simpler and works out of the box for most users

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

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 --port 8080
+bundle exec jekyll serve
 ```
 
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