Installations: Replace link text label with more accessible description

[mao-sz]

Because

You can read a Reddit post for more information isn't sufficiently descriptive by itself. Navigating by links, I wouldn't know what the purpose of it. One of the headings also flagged a TOP013 error and would be better in a note box anyway.

This PR

• Uses a more accessible link text label.
• Convert import note subsection to a note box with a descriptive heading.

Issue

N/A

Additional Information

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

[rlmoser99]

Thank you for taking the time to make this important note stand out better in this lesson, plus changing the link to be more descriptive!