Ruby on Rails: Address lint issues in the Rails Basics section

[goran1010]

Because

Fixing lint issues in the Rails Basics section.

This PR

• Controllers - Add #### Whitelisting "safe" attributes in Rails 3 and #### Handling strong parameters before Rails 8 headings and minor formatting fixes
• Routing - Add #### Don't use the Postman Chrome Extension heading and minor formatting fixes
• Views - Address all the MD004, MD005, MD032, TOP004 and many other rule violations, including few minor formatting issues

Issue

Closes #30446

Pull Request Requirements

• I have thoroughly read and understand The Odin Project curriculum contributing guide
• 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
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• If any lesson files are included in this PR, they follow the Layout Style Guide

[JoshDevHub]

Thank you for making these changes!