Remove hexo-generator-search dependency

Author: GoofySatoshi

package.json

@@ -10,7 +10,6 @@
     "hexo-generator-category": "^2.0.0",
     "hexo-generator-feed": "^3.0.0",
     "hexo-generator-index": "^3.0.0",
-    "hexo-generator-search": "^2.4.3",
     "hexo-generator-searchdb": "^1.5.0",
     "hexo-generator-sitemap": "^3.0.1",
     "hexo-generator-tag": "^2.0.0",