Layout Style Guide: Add new rules

[MaoShizhong]

Because

With the addition of the TOP005 rule in #27674, the layout style guide needs to be updated to include that rule.

Two other rules were missing from the style guide:

1. Use markdown links instead of HTML anchor tags
2. Use the long name for codeblock languages, for any languages that have a long and short form (e.g. javascript and js)

This PR

• Adds the rule covered by TOP005 to the layout style guide
• Also adds a clarification to use markdown links instead of HTML anchor tags
• Adds clarification for using the long language name for codeblocks if a short option is also acceptable
• Fixed TOP005_test.md to abide by the long language name rule

Issue

N/A

Additional Information

The only linting errors that should be present are the expected TOP005 errors from TOP005_test.md.

Pull Request Requirements

• I have thoroughly read and understand The Odin Project 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

[thatblindgeye]

Just one quick change below. Rather than " you should do this..." we should (ha) probably say "You must do this". Make it clear that we will only accept long form names, especially with a rule being made for it/a possible fixer being done.