Add blog post for release 3.1

pages/blog/2024-05-11-release_3_1.md

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+---
+title: 'Release 3.1: 🌱 New package with tiny bundle size'
+---
+
+The primary addition in this release is the new [`@comunica/query-sparql-rdfjs-lite`](https://www.npmjs.com/package/@comunica/query-sparql-rdfjs-lite) package,
+which is optimized for small browser bundle size.
+Currently, the minified size of this package is 648,88 KB (145,79 KB when gzipped).
+This is about as small as you can get without removing required functionality from the SPARQL 1.1 spec
+But if you don't need everything from SPARQL 1.1, it could get much smaller even!
+
+Besides this, several fixes were applied, and some internal changes to our CI to better
+[track the browser bundle size](https://github.com/comunica/comunica/commit/f212b9262f5d2a12a40848f01132299904dc132c)
+and [overall query performance](https://github.com/comunica/comunica/commit/1d8b0d202a7d4728e3692764b33d8795686ce5a0) over time.
+
+<!-- excerpt-end -->
+
+## Full changelog
+
+If you want to learn more about all changes, check out the [full changelog](https://github.com/comunica/comunica/blob/master/CHANGELOG.md#v310---2024-05-11).