Restrict re-naming of bundled resources to be a relative path

[bep]

For some work I'm doing now, I notice that we don't put any restriction on the renaming of bundled resource in front matter.

A bundle resource in a sub folder is being set as subfolder/myresource.txt; so forward slashes and no leading slash (this is a relative path).

But you're then allowed to add leading slash to it with this if you want:

---
title: "My Bundle"
resources:
- name: /foo/bars.txt
  src: foo/txt1.txt
- name: foo/bars2.txt
  src: foo/txt2.txt

Note that I don't think the above is very common, but it will make my situation easier if we can:

• Remove any leading slashes from the new name.
• Also convert any Windows slashes to Unix style.

https://gohugo.io/content-management/page-resources/

[github-actions]

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