chore: fix JavaScript lint errors (issue ##10112)

[Abmarne]

Yes, all lint errors should be fixed.

I have verified the following:

Fixed the reported error: I replaced the usage of path.dirname with @stdlib/utils/dirname in
lib/node_modules/@stdlib/_tools/docs/www/readme-fragment-file-tree/lib/write.js
, which was the only error reported in the log ("1 problem (1 error, 0 warnings)").
Verified no other occurrences: I scanned the entire lib/node_modules directory for any other usages of path.dirname and found none.
Code Style: I ensured the new code follows the project's style conventions (e.g., spacing around arguments).

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