Mention RSS Autodiscovery in RSS Guide

[tylermercer]

📚 Subject area/topic

RSS guide

📋 Suggested page

https://docs.astro.build/en/guides/rss/

📋 General description or bullet points (if proposing new content)

Something like this, as a new section before the Next Steps section in the RSS guide.

Enabling auto-discovery of your RSS feed

RSS autodiscovery, as explained by the RSS Advisory Board, is "a technique that makes it possible for browsers and other software to automatically find a site's RSS feed."

All you need to do is add a link tag to your site's head element, like so:

<link
    rel="alternate"
    type="application/rss+xml"
    title="Your Site's Title"
    href={`${Astro.site}rss.xml`}
/>

After you've done this, your readers can put your site's base URL into their RSS reader to subscribe to your posts, without having to find the specific URL of your RSS feed!

🖥️ Reproduction of code samples in StackBlitz

No response

[tylermercer]

I've made this change on a fork of this repo, but didn't open a PR since the CONTRIBUTING.md says to start with an issue. 🙂

[sarah11918]

Hi @tylermercer ! This sounds like a great addition! We would welcome a PR with this guidance, and a link to the spec. Thank you for your patience as we work through issues, and I appreciate you filing an issue to discuss first! 😄