Add a local search plugin to documentation site (#1329)

* docusaurus 2.0.0-beta.18

* Add a local search plugin to docs site

docs/docusaurus.config.js

@@ -15,7 +15,7 @@ const config = {
   favicon: 'img/favicon.ico',
   organizationName: 'activerecord-hackery',
   projectName: 'ransack',
-  trailingSlash: false,
+  trailingSlash: true,
 
   presets: [
     [
@@ -103,6 +103,18 @@ const config = {
         additionalLanguages: ['ruby', 'erb'],
       },
     }),
+
+  themes: [
+    [
+      require.resolve("@easyops-cn/docusaurus-search-local"),
+      {
+        // `hashed` is recommended as long-term-cache of index file is possible.
+        hashed: true,
+        // needs to be the same as routeBasePath in @docusaurus/preset-classic config
+        docsRouteBasePath: '/'
+      },
+    ]
+  ]
 };
 
 module.exports = config;

docs/package.json

@@ -14,8 +14,9 @@
     "write-heading-ids": "docusaurus write-heading-ids"
   },
   "dependencies": {
-    "@docusaurus/core": "2.0.0-beta.18",
-    "@docusaurus/preset-classic": "2.0.0-beta.18",
+    "@docusaurus/core": "^2.0.0-beta.20",
+    "@docusaurus/preset-classic": "^2.0.0-beta.20",
+    "@easyops-cn/docusaurus-search-local": "^0.25.0",
     "@mdx-js/react": "^1.6.22",
     "clsx": "^1.1.1",
     "prism-react-renderer": "^1.3.1",