Add erb gem to fix Ruby 3.4 compatibility

[this-is-varunxyz]

Problem #46

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.

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[this-is-varunxyz]

@eduardo-rodrigues

[eduardo-rodrigues]

Thank you @this-is-varunxyz. I requested review from the group conveners.

[stale]

This issue or pull request has been automatically marked as stale because it has not had recent activity. Please manually close it, if it is no longer relevant, or ask for help or support to help getting it unstuck. Let me bring this to the attention of @amorenobr @vlukashenko @richa2710 @michmx for now.

[michmx]

Sorry for taking so long. We inherited the style of the page from Carpentries and usually are hesitant to apply any changes without first syncronizing with the upstream. In this particular case, Carpentries has moved to a new style, and we in HSF are moving to use Jupyter books. Therefore I see no harm on applying fixes on our side.

With the disclaimer of not being an expert in Ruby, I can confirm this is safe for builidng the page while it fixes Ruby 3.4 compatibility.

[eduardo-rodrigues]

Happy New Year!

Let me then merge since you did not :).

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