Update Ruby version to 3.4

[rivaquiroga]

This PR updates the version of Ruby used in the deploy workflows (from 3.1 to 3.4) and checks compatibility for generating the site in other environments.

Here is the list of all the changes:

• Update deploy workflows to work with Ruby 3.4
• Update Gemfile to work with Ruby 3.4
• Update environment.yml and environment-osx.yml
• Update Makefile to work with MacOS (tested locally with Ruby 3.4 on Sequoia and Tahoe) and a local installation of Ubuntu (24.02)
• Update Makefile to work in GitHub Codespaces (added make install-codespaces and make serve-codespaces)
• Update README: change instructions from GitPod to GH Codespaces, add note for Windows users, and make a small clarification about the deploy preview.

Close #1107
Close #1039
Close #1101
Close #1039

FOR CONTRIBUTOR

• I have read the CONTRIBUTING.md document

PR Type:

• This PR adds a new blog post
• This PR does something else (explain above)

FOR REVIEWERS

Thanks for taking the time to review! ❤️

Here are the list of things to make sure of:

• The website builds (a check will fail if not)
• All images have been added within the Pull Request and they have Alt text
• If there are paragraphs or text, the key messages are highlighted
• All internal links (within OLS website) use the {% link path_to_file.md %} format
• The preview corresponds to the changes described in the Pull Request
• The code is tidy and passes the linting tests

[yochannah]

🎉 A preview of this PR is available at: https://we-are-ols.org/ols-site-preview/1110/

[yochannah]

🎉 A preview of this PR is available at: https://we-are-ols.org/ols-site-preview/1110/

[yochannah]

🎉 A preview of this PR is available at: https://we-are-ols.org/ols-site-preview/1110/

[yochannah]

🎉 A preview of this PR is available at: https://we-are-ols.org/ols-site-preview/1110/

[yochannah]

okay, I'm on this, but it requires building ruby from source on my machine, which takes ages.

[yochannah]

so do we reckon this is a me problem or a script problem?

[yochannah]

🎉 A preview of this PR is available at: https://we-are-ols.org/ols-site-preview/1110/

[rivaquiroga]

@yochannah, where does conda actually lives in your machine? 👀