feat: add option to hide nav title (#637) (#677)

close #637 

Co-authored-by: Kia Ishii <kia.king.08@gmail.com>

docs/config/theme-configs.md

@@ -33,6 +33,20 @@ export default {
 }
 ```
 
+## siteTitle
+
+- Type: `string | false`
+
+You can customize this item to replace the default site title (`title` in app config) in nav. When set to `false`, title in nav will be disabled. Useful when you have `logo` that already contains the site title text.
+
+```ts
+export default {
+  themeConfig: {
+    siteTitle: 'Hello World'
+  }
+}
+```
+
 ## footer
 
 - Type: `Footer`

src/client/theme-default/components/VPNavBarTitle.vue

@@ -9,8 +9,9 @@ const { hasSidebar } = useSidebar()
 <template>
   <div class="VPNavBarTitle" :class="{ 'has-sidebar': hasSidebar }">
     <a class="title" href="/">
-      <img v-if="theme.logo" class="logo" :src="theme.logo" :alt="site.title">
+      <img v-if="theme.logo" class="logo" :src="theme.logo">
-      {{ site.title }}
+      <template v-if="theme.siteTitle">{{ theme.siteTitle }}</template>
+      <template v-else-if="theme.siteTitle === undefined">{{ site.title }}</template>
     </a>
   </div>
 </template>

types/default-theme.d.ts

@@ -7,6 +7,12 @@ export namespace DefaultTheme {
      */
     logo?: string
 
+    /**
+     * Custom site title in navbar. If the value is undefined,
+     * `config.title` will be used.
+     */
+    siteTitle?: string | false
+
     /**
      * The nav items.
      */