If there's a node_modules unintentionally created anywhere but at the

top of the tree, it's possible for this to interfere when loading

modules in Review Board. For example, Vite (used by Storybook) will

consider it a candidate for module lookup, and could find stale modules.
To make this problem more obvious, we no longer ignore node_modules

anywhere but the top of the tree. git status will then report any

stray copies, helping address the problem.

Installed packages in a subdirectory and ran git status. Saw the

stray `node_modules.