Add missing RSS feed, update zola

[kilimnik]

I noticed that the templates include an rss.xml definition, though you are not using it. The default zola behaviour is to use the atom.xml, so I updated the config.toml to use both.

I also changed generate_feed to generate_feeds as this is the new option which should be used with the new version.

As this is a new zola feature, I also decided to update zola to the newest version.

[MTRNord]

@thibaultamartin what version does cloudflare currently use? :) We obviously cant merge this if our cloudflare deployment doesnt support it yet.

[kilimnik]

@thibaultamartin what version does cloudflare currently use? :) We obviously cant merge this if our cloudflare deployment doesnt support it yet.

You are uploading the built html page to cloudflare. The zola build process is running inside the GitHub Actions

[MTRNord]

@thibaultamartin what version does cloudflare currently use? :) We obviously cant merge this if our cloudflare deployment doesnt support it yet.

You are uploading the built html page to cloudflare. The zola build process is running inside the GitHub Actions

Its a little more difficult than that in reality since we also use the preview feature of cloudflare which is built on the side of cloudflare instead :)