Add docs base path

Author: ScriptSmith

docs/components/story-embed.tsx

@@ -33,7 +33,8 @@ export function StoryEmbed({ storyId, height = 200, title }: StoryEmbedProps) {
     return () => observer.disconnect();
   }, []);
 
-  const src = `/storybook/iframe.html?id=${storyId}&viewMode=story&globals=theme:${theme}`;
+  const basePath = process.env.DOCS_BASE_PATH || "";
+  const src = `${basePath}/storybook/iframe.html?id=${storyId}&viewMode=story&globals=theme:${theme}`;
 
   return (
     <iframe

docs/next.config.mjs

@@ -6,16 +6,19 @@ const withMDX = createMDX();
 const cargoToml = readFileSync("../Cargo.toml", "utf-8");
 const version = cargoToml.match(/^version\s*=\s*"(.+)"/m)?.[1] ?? "latest";
 
+const basePath = process.env.DOCS_BASE_PATH || "";
+
 /** @type {import('next').NextConfig} */
 const config = {
-  env: { HADRIAN_VERSION: version },
+  env: { HADRIAN_VERSION: version, DOCS_BASE_PATH: basePath },
   reactStrictMode: true,
   // Static export for serving from gateway
   output: "export",
   // Output to 'out' directory (default, can be served by gateway)
   distDir: "out",
   // Use trailing slashes for cleaner static URLs
   trailingSlash: true,
+  ...(basePath && { basePath }),
 };
 
 export default withMDX(config);