Add bilingual manual and localized docs routes

site/decodal-site/src/pages/docs/[...slug].astro

@@ -1,20 +0,0 @@
----
-import ManualLayout from '../../layouts/ManualLayout.astro';
-import { allDocSlugs, docTitle, renderMarkdown } from '../../lib/docs.js';
-import '@fontsource/ibm-plex-sans-jp/400.css';
-import '@fontsource/ibm-plex-sans-jp/600.css';
-
-export function getStaticPaths() {
-  return allDocSlugs().map((slug) => ({
-    params: { slug },
-    props: { slug },
-  }));
-}
-
-const { slug } = Astro.props;
-const html = renderMarkdown(slug);
-const title = docTitle(slug);
----
-<ManualLayout title={`${title} — Decodal Manual`} active={slug}>
-  <article class="markdown" set:html={html} />
-</ManualLayout>

site/decodal-site/src/pages/docs/en/[...slug].astro

@@ -0,0 +1,20 @@
+---
+import ManualLayout from '../../../layouts/ManualLayout.astro';
+import { allDocSlugs, docTitle, renderMarkdown } from '../../../lib/docs.js';
+import '@fontsource/ibm-plex-sans-jp/latin-400.css';
+import '@fontsource/ibm-plex-sans-jp/latin-600.css';
+
+export function getStaticPaths() {
+  return allDocSlugs('en').map((slug) => ({
+    params: { slug },
+    props: { slug },
+  }));
+}
+
+const { slug } = Astro.props;
+const html = renderMarkdown(slug, 'en');
+const title = docTitle(slug, 'en');
+---
+<ManualLayout title={`${title} — Decodal Manual`} active={slug} locale="en">
+  <article class="markdown" set:html={html} />
+</ManualLayout>

site/decodal-site/src/pages/docs/en/index.astro

@@ -0,0 +1,16 @@
+---
+import ManualLayout from '../../../layouts/ManualLayout.astro';
+import { renderMarkdown } from '../../../lib/docs.js';
+import '@fontsource/ibm-plex-sans-jp/latin-400.css';
+import '@fontsource/ibm-plex-sans-jp/latin-600.css';
+
+const html = renderMarkdown('index', 'en');
+---
+<ManualLayout
+  title="Decodal Manual"
+  description="The Decodal language specification and public APIs for embedding it in applications."
+  active="index"
+  locale="en"
+>
+  <article class="markdown" set:html={html} />
+</ManualLayout>

site/decodal-site/src/pages/docs/index.astro

@@ -1,11 +1,3 @@
 ---
-import ManualLayout from '../../layouts/ManualLayout.astro';
-import { renderMarkdown } from '../../lib/docs.js';
-import '@fontsource/ibm-plex-sans-jp/400.css';
-import '@fontsource/ibm-plex-sans-jp/600.css';
-
-const html = renderMarkdown('index');
+return Astro.redirect('/docs/en/');
 ---
-<ManualLayout title="Decodal Manual" description="Decodalの言語仕様と、アプリケーションへ組み込むための公開API。" active="index">
-  <article class="markdown" set:html={html} />
-</ManualLayout>

site/decodal-site/src/pages/docs/ja/[...slug].astro

@@ -0,0 +1,20 @@
+---
+import ManualLayout from '../../../layouts/ManualLayout.astro';
+import { allDocSlugs, docTitle, renderMarkdown } from '../../../lib/docs.js';
+import '@fontsource/ibm-plex-sans-jp/400.css';
+import '@fontsource/ibm-plex-sans-jp/600.css';
+
+export function getStaticPaths() {
+  return allDocSlugs('ja').map((slug) => ({
+    params: { slug },
+    props: { slug },
+  }));
+}
+
+const { slug } = Astro.props;
+const html = renderMarkdown(slug, 'ja');
+const title = docTitle(slug, 'ja');
+---
+<ManualLayout title={`${title} — Decodalマニュアル`} active={slug} locale="ja">
+  <article class="markdown" set:html={html} />
+</ManualLayout>

site/decodal-site/src/pages/docs/ja/index.astro

@@ -0,0 +1,16 @@
+---
+import ManualLayout from '../../../layouts/ManualLayout.astro';
+import { renderMarkdown } from '../../../lib/docs.js';
+import '@fontsource/ibm-plex-sans-jp/400.css';
+import '@fontsource/ibm-plex-sans-jp/600.css';
+
+const html = renderMarkdown('index', 'ja');
+---
+<ManualLayout
+  title="Decodalマニュアル"
+  description="Decodalの言語仕様と、アプリケーションへ組み込むための公開API。"
+  active="index"
+  locale="ja"
+>
+  <article class="markdown" set:html={html} />
+</ManualLayout>