Update README.md with updated links to content helping get set up

[cgorshing]

PR Summary

I felt the README links could be updated with a video showing more recent features. John Savill's video helped me get more things set up for my env and showed what was possible.

I added dates, this is subjective and obviously can easily be determined by visiting the links, I just thought having something to show how well those relate to the current state of PSReadLine. Maybe specifying what version of PSReadLine those articles relate to would be another option. I can remove them if felt as though they do not belong.

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure you've added one or more new tests
• Make sure you've tested these changes in terminals that PowerShell is commonly used in (i.e. conhost.exe, Windows Terminal, Visual Studio Code Integrated Terminal, etc.)
• User-facing changes
  • Not Applicable
  • OR

Microsoft Reviewers: Open in CodeFlow

[daxian-dbw]

That looks great! Thank you!