What You Can Do to Prepare: Edit content of the lesson to fix lint errors

[goran1010]

Because

A fairly large amount of work was needed to both fix the lint issues, as well as to improve the overall look and feel of this lesson.

This PR

• Create Lesson overview, Assignment, Knowledge check and Additional resources sections
• Move links and articles from various sections in the lesson into the Assignment section
• Rework most of the sentences describing the articles in the Assignment section, to improve the look and feel of the lesson

Additional Information

This lesson marks the last lesson in the Getting Hired course needing to be fixed-- yay 🎉

Overall, vast majority of the lint errors in the course have been resolved, with only a few exceptions to the lessons that already have work being done on them (Project Resume), or couple of lessons where major rewrite is needed to improve the content, and therefore make fixing those lint errors at all possible (Conclusion and How This Course Will Work).

Since I've started from the tail end of the curriculum, I'll continue in that order, meaning the next course I'll be fixing, is the NodeJS course -- hopefully next few courses will be more straightforward to fix, since they're not as outdated as Getting Hired course.

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