Clarify use of .babelrc in typescript instructions

[IanVS]

Issue:

What I did

This fixes an inaccuracy from #18101, since the babel config will apply to all files, not just config files.

I also added a note about ts-node, even though it has some pitfalls and might not work great for all cases. I think both of these options are short-term until 7.0 is released with better support.

I removed @babel/preset-env from the example babel config, since it's not really useful without being configured, and it has nothing to do with using typescript.

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

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