fix: Cannot find module generate-slug imported from anchor-links/index.js

[mterrel]

Fixes: #234

🎟️ Asana Task

---

Description

Fixes the following error when trying to import anchorLinks:

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/home/mark/xxx/node_modules/@hashicorp/platform-remark-plugins/util/generate-slug' imported from /home/mark/xxx/node_modules/@hashicorp/platform-remark-plugins/plugins/anchor-links/index.js
    at new NodeError (internal/errors.js:322:7)
    at finalizeResolution (internal/modules/esm/resolve.js:308:11)
    at moduleResolve (internal/modules/esm/resolve.js:731:10)
    at Loader.defaultResolve [as _resolve] (internal/modules/esm/resolve.js:842:11)
    at Loader.resolve (internal/modules/esm/loader.js:89:40)
    at Loader.getModuleJob (internal/modules/esm/loader.js:242:28)
    at ModuleWrap.<anonymous> (internal/modules/esm/module_job.js:76:40)
    at link (internal/modules/esm/module_job.js:75:36) {
  code: 'ERR_MODULE_NOT_FOUND'
}

The problem here is that the package has been migrated to ESM incompletely. Specifically, imports in an ESM project must include the file extension. This PR adds .js to the offending import.

PR Checklist 🚀

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• Add or update tests as appropriate.
• Write a useful description (above) to give reviewers appropriate context.
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