Ignore media properties

[paulrobertlloyd]

Currently, the reference implementation ignores fetching references for the url property, this being the URL of the source post.

In testing, a media endpoint can return a fully resolved URL to a photo (or other media item); this can then get referenced, which doesn’t really make much sense, and doesn’t add any useful information. Example:

---
date: 2024-10-05T20:32:16.624+01:00
photo:
  - url: media/photos/2024/279/p1/image.jpg
references:
  https://indiekitSandboxNetlifyApp/media/photos/2024/279/p1/imageJpg:
    url: https://indiekit-sandbox.netlify.app/media/photos/2024/279/p1/image.jpg
---
Test from Micro.blog.

What happened here was that Indiekit’s media endpoint returned a fully resolved URL for the media item, and then the post template updated the URL for photo to be a relative path to the file. However, somewhere in the flow of things, the URL for the photo got referenced and appended to the post properties.

This PR adds audio, photo and video properties to url to a list of properties to ignore, and thus never seek to get reference data for.

@aciccarello; am going to publish this in the next minor release, can refine in subsequent releases if you think I may have got this wrong.

[aciccarello]

Wow, that's a strange result. Ignoring those properties seems reasonable to me.