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

top of the tree, it's possible for this to interfere with consumers of

Djblets. 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.