readme: link to deployment

README.md

@@ -2,3 +2,13 @@
 
 This is an [Astro](https://astro.build/) implementation of our group web site
 [saezlab.org](https://saezlab.org).
+
+## How does it work?
+
+This site is automatically built by [this action](/blob/master/.github/workflows/deploy.yml)
+and deployed under [this address](https://saezlab.github.io/saezlab.org-next/).
+The site uses the [Astro framework](https://astro.build/) with
+[Svelte](https://svelte.dev/) integration.
+
+This stuff is very easy to work with, I encourage everyone to play around with
+it and contribute to the design of our new page.