Docs: Document how to import and configure the parser for flat config about typescript-eslint

[bradzacher]

When doing so, the surprising thing I found is that tseslint does not currently support flat config correctly, as it still uses extends, the old parser and parserOptions setup, and uses strings to declare the parser and plugins neither of which is supported by eslint anymore:

You've gotten to the wrong place. Those are the legacy configs consumed within legacy configs only. The flat configs are accessed via the typescript-eslint package and are thus located within that package:

https://github.com/typescript-eslint/typescript-eslint/tree/main/packages/typescript-eslint/src/configs

You'll notice that these are flat configs.

[bradzacher]

Did you check out the docs for the typescript-eslint package...?

https://typescript-eslint.io/packages/typescript-eslint#advanced-usage