move plugin config in separate file

.vuepress/config/plugins.js

@@ -0,0 +1,18 @@
+import { searchProPlugin } from 'vuepress-plugin-search-pro'
+
+export default [
+  searchProPlugin({
+    indexContent: true,
+    autoSuggestions: true,
+    customFields: [
+      {
+        getter: (page) => page.frontmatter.category,
+        formatter: "Category: $content",
+      },
+      {
+        getter: (page) => page.frontmatter.tag,
+        formatter: "Tag: $content",
+      },
+    ],
+  }),
+]