docs: add note for Babel config

[jasopolis]

Summary

Update the troubleshooting docs page to include a note that Babel configured with .babelrc will not work when trying to compile any part of node_modules, even when transformIgnorePatterns is updated. Instead, the Babel config must be renamed to babel.config.js. (See Babel docs: https://babeljs.io/docs/configuration#whats-your-use-case)

This is not well documented elsewhere, so this could be helpful for folks debugging the fairly common "Cannot use import statement outside a module" error.

Test plan

(n/a, docs update)

Does this PR introduce a breaking change?

• Yes
• No

Other information

Since this is pretty minor, I just created the PR here, but am happy to open an issue/discussion if preferred! Thank you

[kulshekhar]

Thank you @jasopolis!