feat(installing_ruby): add content for updating ruby version and setting global and local versions

[XAJX179]

Because

Adding step by step instructions on how to update ruby version for beginners.

This PR

• Adds step by step instructions on how to update ruby installation.
• Adds content on setting local and global ruby versions.

Issue

Closes #30470

Additional Information

Pull Request Requirements

• [x] I have thoroughly read and understand The Odin Project curriculum contributing guide
• [x] The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• [x] The Because section summarizes the reason for this PR
• [x] The This PR section has a bullet point list describing the changes in this PR
• [x] If this PR addresses an open issue, it is linked in the Issue section
• [x] If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• [x] If any lesson files are included in this PR, they follow the Layout Style Guide