feat: Arg Components

[MichalBryxi]

• Adding the description article to discuss the contents and what are the other reasonable use-cases. Happy to expand the exercises if this is the right direction.
• I think this nicely shows the <@foo /> pattern from here.
• Also follows-up on the Discord conversataion.

Summary

• I was unsure if this pattern was possible, but it is and I think there is no good understanding for folks that they can do this.
• So expanding on the topic here.

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[NullVoxPopuli]

Happy to expand the exercises if this is the right direction.

I would say so! nice work! that second example is really good (good to have both tho), thanks for coming up with that!

[MichalBryxi]

• Added link to docs. Plus minus. It's not exactly the topic, but covers said syntax.
• Added exercise:
  • It combines simple passing down of the components and yielded components.
  • It's a bit verbose, but I did not want to introduce even more patterns. The only one "extra" here is yield.
  • Also added comment to make sure what is the assignment.

[NullVoxPopuli]

looks good! thank you!!!