[w3c/permissions] replace cdn.w3.org by www.w3.org (PR #416)

Simple PR to replace cdn.w3.org by www.w3.org (cdn.w3.org is going down) on the official ED.
[Respec has already been fixed](https://github.com/w3c/respec/pull/4442).


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### :boom: Error: 500 Internal Server Error :boom: ###

[PR Preview](https://github.com/tobie/pr-preview#pr-preview) failed to build. _(Last tried on Jun 12, 2023, 6:18 AM UTC)_.

<details>
<summary>More</summary>


PR Preview relies on a number of web services to run. There seems to be an issue with the following one:

:rotating_light: [Spec Generator](https://www.w3.org/2015/labs/) - Spec Generator is the web service used to build specs that rely on ReSpec.

:link: [Related URL](https://labs.w3.org/spec-generator/?type=respec&url=https%3A%2F%2Fraw.githubusercontent.com%2Fw3c%2Fpermissions%2F03707d52cd3609c50f355a237c607adb84f4db26%2Findex.html%3FisPreview%3Dtrue)

```
🕵️‍♀️  That doesn't seem to be a ReSpec document. Please check manually: https://labs.w3.org/spec-generator/uploads/uq6zzx/index.html?isPreview=true%3FisPreview%3Dtrue&publishDate=2023-06-12
```

_If you don't have enough information above to solve the error by yourself (or to understand to which web service the error is related to, if any), please [file an issue](https://github.com/tobie/pr-preview/issues/new?title=Error%20not%20surfaced%20properly&body=See%20w3c/permissions%23416.)._
</details>

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/416

-- Commit Summary --

  * replace cdn.w3.org by www.w3.org

-- File Changes --

    M index.html (36)

-- Patch Links --

https://github.com/w3c/permissions/pull/416.patch
https://github.com/w3c/permissions/pull/416.diff

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