docs: canonical url

packages/web/astro.config.mjs

@@ -9,13 +9,10 @@ import { rehypeHeadingIds } from "@astrojs/markdown-remark"
 import rehypeAutolinkHeadings from "rehype-autolink-headings"
 
 const github = "https://github.com/sst/opencode"
-const stage = process.env.SST_STAGE || "dev"
 
 // https://astro.build/config
 export default defineConfig({
-  site: stage === "production"
-    ? `https://${config.domain}`
-    : `https://${stage}.${config.domain}`,
+  site: config.url,
   output: "server",
   adapter: cloudflare({
     imageService: "passthrough",