feat(theme): allow overriding logo link

closes #1683

Author: brc-dd

Diff for: src/client/theme-default/components/VPNavBarTitle.vue

@@ -12,7 +12,7 @@ const { currentLang } = useLangs()
 
 <template>
   <div class="VPNavBarTitle" :class="{ 'has-sidebar': hasSidebar }">
-    <a class="title" :href="normalizeLink(currentLang.link)">
+    <a class="title" :href="theme.logoLink ?? normalizeLink(currentLang.link)">
       <slot name="nav-bar-title-before" />
       <VPImage v-if="theme.logo" class="logo" :image="theme.logo" />
       <template v-if="theme.siteTitle">{{ theme.siteTitle }}</template>

Diff for: types/default-theme.d.ts

@@ -13,6 +13,11 @@ export namespace DefaultTheme {
      */
     logo?: ThemeableImage
 
+    /**
+     * Overrides the link of the site logo.
+     */
+    logoLink?: string
+
     /**
      * Custom site title in navbar. If the value is undefined,
      * `config.title` will be used.