Revert "try trailingSlash: "never" instead"

This reverts commit 41572e2.

This didn't work. Sorry for the spam, maybe I should just set up
preview branches?

Author: qaisjp

web/astro.config.mjs

@@ -7,7 +7,11 @@ import starlightScrollToTop from 'starlight-scroll-to-top'
 
 export default defineConfig({
   site: SITE_URL,
-  trailingSlash: 'never',
+  build: {
+    // Generates /reference/createBlip.html instead of /reference/createBlip/index.html
+    // which makes the canonical URL not have a trailing slash.
+    format: 'file',
+  },
   redirects: {
     '/reference/matrix': '/reference/Matrix',
   },