Add erb gem to fix Ruby 3.4 compatibility #1769
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Problem #1767
When running (bundle exec jekyll serve) with Ruby 3.4.5 on Arch Linux, Jekyll fails with:
cannot load such file -- erb (LoadError)
Solution
Added (gem 'erb') to the Gemfile to explicitly declare the dependency.
While erb is a default gem in Ruby 3.4+, explicitly declaring it in the Gemfile ensures Jekyll can properly load it across different Ruby installations and environments.