Fix broken links related to the new "Trusted publishing" page

[generalmimon]

The internal links added in #1674 followed the on-disk paths and did not respect that the URL paths use a different scheme, as explained in https://github.com/npm/documentation/blob/4c574b89e23515d8411e5ec52624d6a932b874e0/CONTRIBUTING.md#urls:

URLs

Note that for backward compatibility reasons, the on-disk paths are not precisely identical to the URLs for the documentation. To keep URLs expressive but still short, intermediate directories are removed from a page's URL.

(...)

You might (understandably) expect the page "Creating Node.js modules" to be URL-wise beneath contributing-packages-to-the-registry, but unfortunately, you would be wrong. To keep URLs short, the intermediate folder paths are removed from pages, so "Creating Node.js modules" becomes https://docs.npmjs.com/creating-node-js-modules.

Also see https://github.com/npm/documentation/blob/4c574b89e23515d8411e5ec52624d6a932b874e0/CONTENT-MODEL.md#content-structure:

Content structure

Docs are grouped by topic.

• Top-level doc set (Example: https://docs.npmjs.com/packages-and-modules)
  • Categories (Example: https://docs.npmjs.com/packages-and-modules/introduction-to-packages-and-modules)
    • Articles (Example: https://docs.npmjs.com/about-packages-and-modules)

As a result, these links did not work at https://docs.npmjs.com/. This PR fixes them.

References

Related to #1674 (all links fixed in this PR were introduced there)

[leobalter]

Thank you so much for catching my broken links here!

[generalmimon]

In the last force push, I restored the significant trailing spaces in content/packages-and-modules/securing-your-code/requiring-2fa-for-package-publishing-and-settings-modification.mdx (link) - this should fix the failure of the CI job Lint.