docs: add cards and callout

chore: minor update to sidebar

chore: add simple translation in Japanese

hugo.toml

@@ -5,6 +5,17 @@ baseURL = "https://example.org"
 
 disableKinds = ["taxonomy", "term"]
 
+defaultContentLanguage = 'en'
+[languages]
+  [languages.ja]
+    languageName = '日本語'
+    weight = 1
+    title = 'Hextra テーマ'
+  [languages.en]
+    languageName = 'English'
+    weight = 2
+    title = 'Hextra Theme'
+
 [module]
   [module.hugoVersion]
     extended = true
@@ -31,6 +42,10 @@ disableKinds = ["taxonomy", "term"]
     source = "assets/.*\\.(.*)$"
     target = "$1"
 
+[markup]
+  [markup.goldmark]
+    [markup.goldmark.renderer]
+      unsafe = true
 
 [menu]
   [[menu.main]]