docs(website): Replace Algolia with local search

Replace the Algolia search with docusaurus-search-local [1] to not
depend on an external service for the search function.

The same plugin is already successfully being used on the ORT Server
website [2].

[1]: https://github.com/easyops-cn/docusaurus-search-local
[2]: https://eclipse-apoapsis.github.io/ort-server/search/

Signed-off-by: Martin Nonnenmacher <[email protected]>

Author: mnonnenmacher

website/docusaurus.config.js

@@ -55,6 +55,21 @@ const config = {
     ],
   ],
 
+  themes: [
+    [
+      '@easyops-cn/docusaurus-search-local',
+      {
+        hashed: true,
+        indexBlog: false,
+        docsDir: ['docs'],
+        docsRouteBasePath: ['/docs'],
+        searchResultLimits: 15,
+        searchResultContextMaxLength: 200,
+        explicitSearchResultPath: true,
+      },
+    ],
+  ],
+
   themeConfig:
     /** @type {import('@docusaurus/preset-classic').ThemeConfig} */
     ({
@@ -136,17 +151,6 @@ const config = {
         darkTheme: darkCodeTheme,
         additionalLanguages: ['bash', 'batch'],
       },
-      algolia: {
-        // The application ID provided by Algolia.
-        appId: 'GBVAB0K8M8',
-
-        // The public API key, safe to commit.
-        apiKey: '4f04967a5a1f4b277d59d741a077affd',
-
-        indexName: 'oss-review-toolkit',
-        contextualSearch: true,
-        searchPagePath: 'search',
-      },
     }),
 };