Add featured image to rss feed

[MelissaAutumn]

Resolves #35

Preview

I'm not sure if we want to adjust the presentation. It's currently not centred, and for readability purposes, I've restricted the size to 640x360 Based on the ticket description, we'll be showing this on thunderbird.net?

I've attached the generated rss feed: zOJWLedH.rss.zip

I've also added some comments to help you follow along in-case you don't know WordPress development. 😄

[Sancus]

I'm not sure if we want to adjust the presentation. It's currently not centred, and for readability purposes, I've restricted the size to 640x360 Based on the ticket description, we'll be showing this on thunderbird.net?

Yeah, if you look at thunderbird.net right now you'll see that there are blog post previews but they would look a lot better with the title images.

We are obviously going to have to resize these images or do something and I am concerned about making sure the aspect ratio consistently fits, because we don't want to be warping images either.

[MelissaAutumn]

Okay there's some styling on thunderbird-website (will open a separate pr) to do, but I can do this with the atom feed, and a custom link entry. (See https://github.com/thundernest/thunderbird-website/pull/358)

Do we still want the image in content? (For RSS readers)

[Sancus]

Do we still want the image in content? (For RSS readers)

Yeah, I think it is better to have it there too.

[Sancus]

@devmount Want to give this a quick check over? Thanks!