feat: add suggestions num config

Author: sakihet

Diff for: lib/default-theme/SearchBox.vue

@@ -51,7 +51,7 @@ export default {
         return
       }
 
-      const max = 5
+      const max = this.searchBoxConfig.suggestionsMax
       const { pages } = this.$site
       const localePath = this.$localePath
       const matches = item => (
@@ -88,6 +88,9 @@ export default {
       const navCount = (this.$site.themeConfig.nav || []).length
       const repo = this.$site.repo ? 1 : 0
       return navCount + repo <= 2
+    },
+    searchBoxConfig () {
+      return Object.assign({ suggestionsMax: 5 }, this.$site.themeConfig.searchBox)
     }
   },
   methods: {