Foundation: Add infobox concerning vscode repository popup

Checks

[X] This is not a duplicate of an existing issue (please have a look through our open issues list to make sure)
[X] I have thoroughly read and understand The Odin Project Contributing Guide
[X] Would you like to work on this issue?

Describe your suggestion

It seems like lots of people are asking in the discord whether they should install the Microsoft apt repository during vs code installation.

This could be alleviated with a simple extra line before the installation steps, or wherever may be better. It seems like something people needn't be delayed for during installation, and I have seen it asked quite a few times.

Path

Foundations

Lesson Url

https://www.theodinproject.com/lessons/foundations-text-editors

(Optional) Discord Name

No response

(Optional) Additional Comments