chore(macros/LearnSidebar): add Games Developing section

[pepelsbey]

Summary

Features the Games section and a few articles in the Learn sidebar.

Fixes #8948

Problem

Low visibility of the Games section.

Solution

• The title goes to the main game dev landing
• There are three key articles under the toggler (debatable)

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Screenshots

[bsmth]

This looks good to me. One other one looks interesting: https://developer.mozilla.org/en-US/docs/Games/Techniques do you think it's worth adding?

[bsmth]

@caugner do you know if there's a different way to handle relative paths like this, or is ../ okay to use here?

[pepelsbey]

It was the only way I could get out of the Learn section. It works, but there might be a better way :)

[caugner]

I guess the best would be to move the Games section inside the Learn section, but otherwise I'm glad that the ../ syntax works. It makes it obvious that we're including pages from a different section.

[bsmth]

move the Games section inside the Learn section

That's a good idea. We should keep this in mind for Learn area refresh when we get to it.

[pepelsbey]

One other one looks interesting … do you think it's worth adding?

A good one! Added.

[bsmth]

Thanks, both! 🙌🏻