Put `npm`'s bin directory on `$PATH` when using direnv.

This allows developers (hi) to run tools installed via NPM without having to run `npm exec` or `npx` to do so. It's mostly for ergonomics, but it's nice to be able to run `vite build` and have it "just" work.

The "canonical" invocations, used in tool scripts or when `build.rs` has to run Node, uses `npx`. More generally, we don't assume direnv, even though the source tree provides it.

There is no corresponding `layout rust` in `direnv`, but the same niche is fulfilled by the `PATH_add` targeting Cargo's output directory. I also considered using `PATH_add` instead of `layout` for this, as they do the same thing (at least as of this version of `direnv`), but I think it's probably more appropriate to use the parts of direnv that express the broader intention to use Node's tools than to manually implement them myself.

If you're using `direnv` across this change, you'll need to re-run `direnv allow`.

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