Open links in new tabs

[jwhudnall]

Because

2 external links don't conform to the convention of opening in a new tab, and overwrite the current one. Opening these in new tabs should improve the reader's experience.

This PR

• Update URL reference syntax for 2 external link references (from anchor tags to bracket/parenthesis notation).

Issue

N/A

Additional Information

N/A

Pull Request Requirements

• [x ] I have thoroughly read and understand The Odin Project 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

[ManonLef]

I see you've checked the requirement of previewing with our markdown preview tool. However, in that tool, it doesn't render correctly. That specific link is inside a div note element, hence why we have to use the a with href. Do you want to revert this and fix the a element link opening behaviour instead?

[ManonLef]

Thank you for the quick follow up and this PR!